Viewing Mod
Eevee is a new adorable character with 5 available eeveelutions!
Created 11 months ago

It's Eevee!

Isaac's Mom is closing in as Isaac finds a trapdoor to the Basement, hidden under his rug. Too terrified to risk surviving the fall or breaking his precious legs, he sends his trusty Pokémon, Eevee, down to kill Mom for him.

This mod is compatible with the No Costumes Mod and Classy Vs. Screen. I recommend playing with the No Costumes Mod enabled in order to retain Eevee's looks near-perfectly.


  • A New Character: Eevee!
  • Evolutions! Evolve into the 5 currently implemented eeveelutions that act as transformations, but are essentially entire characters! Find evolution stones for Flareon, Jolteon, and Vaporeon, but follow the happiness system for Espeon and Umbreon!
  • Unlocks! The Eeveelutions are locked behind your typical character unlocks. Currently there's one for It Lives (not Mom's Heart), Boss Rush, Hush, Satan, and Isaac.
  • A Happiness system! When collecting coins, bombs, keys, or items, your happiness will increase based on their value. You track this via the emoticons that appear above you (either automatically when they update, or when expanding the map). Used for evolving into Espeon and Umbreon.
  • Vitamin items! One vitamin exists for each stat. They also give you a good boost in happiness.
  • Lots of unique changes! Every evolution and Eevee gets their own spritesheet, tear sprite with sfx, hurt sounds, Boss VS portrait, completely custom flight sprite, and more!
  • And much more! There's lots of small details and unique features in this mod that make Eevee fun to play. I've poured a lot of love into this mod, and continuing to do so as I develop the other eeveelutions!

Eeveelution Abilities

NOTE: You don't really have to read through this as, once you gain the eeveelutions, it doesn't take long to learn everything about them. If you're still confused, you can read through here.

  • Flareon: Flare Blitz Double tap any movement direction while holding the second tap. This will charge up Flare Blitz. Once ready, release to use the move. You'll charge across the room, leaving fire on the floor and damaging enemies in your path, while also burning enemmies nearby. At the end of Flare Blitz when you hit a wall, you'll get damaged for 1 heart.
  • Jolteon: Charge/Discharge! Jolteon's Charge is just that: A chargebar! Firing your tears will have you charge Charge for up to 3 levels, where you can release your fire keys for Discharge once you hit at least 1 bar of charge. Discharge is a ring of electricity that gets sent out around you, damaging enemies based on your player's damage and your Charge level. Enemies also have a chance to be inflicted with a new status effect, Paralysis, which infliction chance is also based on your Charge level. If inclifcted, at random, enemies will be randomly petrified for a short period of time. Paralysis never goes away unless the enemy dies.
  • Vaporeon: Aqua Ring! Vaporeon will be constantly surrounded by a ring of water. Upon clearing a room, it will go up one tier, partially changing color. Once its completely changed to the new color, you can stand still and claim a soul or black heart depending on the tier. Getting hit at all removes your Aqua Ring, and clearing another room has you gain it back at tier 0.
  • Umbreon: Dark Pulse! Charge up a "to-the-side" chargebar (Ex: See Maw of the Void) and release a pulse of dark energy which knocks back projectiles and enemies. Fear is also applied to those enemies. (Slightly nerfed in next update)
  • Espeon: Light Screen! Like Umbreon's method of charging up, but instead placing down a Light Screen! This magical mirror reflects any projectiles and adds homing onto them (Largely buffed in next update)

Other things to note:

  • If something goes wrong, make sure you don't have any mods on that could be related to the issue! Report any bugs in the bug discussion.
  • Feel free to suggest any small additions that would make Eevee just that tiny bit more fun to play! This usually goes along the lines of "It would be cool if..."
  • Yes, this mod is still being developed. Yes, that means Sylveon too.
  • If you decide to make a video on this mod, I kindly ask that you leave a workshop link in the description!
  • I'm doing the best I can to have everything explained in-game without any questions left behind...I can only type so much here. I suggest visiting my discord server to ask about anything (or this page's comments)
  • If you want to evolve just to test the eeveelution out, type "evolve" and then your desired evolution in the debug console. Also works with "eevee" and "sanio".
  • Type "shinytoggle" to toggle your shiny on and off.

Planned Features:

  • Implementing the rest of the Eeveelutions
  • Adding unique costumes to Eevee and the Eeveelutions for any popular items (Brimstone, Monstro's Lung, Ludo, Tech 1 and 2, Godhead, etc)
  • True Co-Op Support (Suspended till Repentance)
  • A mysterious 9th Eeveelution unique to this mod!
  • An Eevee familiar that you can only find as other characters. It'll act similarly to Eevee as a character (evolutions and abilities) but much more toned down.
  • For certain holidays, I'd like to release addons as separate mods on the workshop.

Currently Being Worked On:

  • Nothing at the moment. Next thing I'll be working is Glaceon and Leafeon!

Known Issues:

  • If you pick up Burning Bush while playing as Eevee, you don't shoot out anything, and so you deal 0 damage. (Unknown as to how to fix)
  • When pressing left and right or up and down when Flare Blitz is fully charged, your next double tap charge will act strange. The ability itself was a pain to manage so I won't be fixing this until I feel I should get around to it.
  • Renders such as Espeon and Umbreon's chargebars, the Emoticons, and the Boss Vs. Player Portraits may not appear for the entirety of a run.

Special Thanks:

  • My QA Testers: Kaltriv, Chiefo Joey, i8bacon, and Seb135!
  • orisghost for creating all the amazing boss portrait sprites!
  • Kaltriv for creating Electro Ball's animation and all achievement pages!
  • TikaraTheMew for the workshop thumbnail and workshop image art of Eevee and the eeveelutions!
  • Many people in the Binding of Isaac discord for being a huge help. They'll always be out to help those in #modding.
  • Lytebringer's tutorials for giving me a general idea of what to do.
  • lambchop for influencing how I go about creating my code.
  • @HHappyTotalX for providing 3D models of Eevee & Vaporeon to help me with sprites.
  • @TerriLinkan for providing the side sprites for Eevee's ears and hair fluff, which was used for other sprites too.
  • Sbody2 for proper tear rotation and scaling on the animated tear moves.
  • Tesseract for creating the cacheHandler and teaching me how to properly handle the stat calculations.
  • Wofsauge for helping me with Espeon and Umbreon's chargebars and helped improve my costume and spritesheet applying code.
  • piber20 for the Shadow Ball sprite code and piber20helper for achievements.
  • Taz for creating the double tap code for Flare Blitz.
  • Pokémon 3D, a fan-made 2.5 remake of Pokémon Gold and Silver, for saving me any trouble ripping sprites from the Pokémon games.
  • Sevenut for the character select sprite and name!
  • ALL OF YOU for supporting my mod and giving it lots of love. You helped more than any one person could.

This mod is also available on the Steam Workshop


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- Additions

- Created player data for other modders to use named "Eevol", which contains the same string for the mod's save data that tracks what evolution you are. So if you wanted to do anything specific for the eeveelutions, use player:GetData().Eevol and check for "umbreon", "flareon" "vaporeon", etc. Will automatically include any eeveelutions added in the future!

- Debug items have been replaced with actual debug console commands!

- Type "evolution" and then your desired evolution! Works with "eevee" and "sanio as well.

- Type "shinytoggle" to toggle on and off a shiny form.

- Changes

- Debug items have been removed entirely in favor of the new debug console commands

- The way evolutions are handled and their icon renders (Chargebars and otherwise) are much more efficient and readable in the code.

- Bug Fixes

- Renders specific to eeveelutions such as the chargebars now load appropriately when continuing a save

- Fixed Vaporeon's neck fin not showing up when walking up

- POSSIBLY fixed the Boss Vs. Render Bug. It was only one of many possible ways it's not showing up for others.

- Additions

- A little nose was added to Eevee and every evolution's side heads.

- Leafeon's sprites (aside from the boss vs., as with Glaceon) have been completed, and has been implemented into the mod. -Like Glaceon, they have no special stats or abilities yet, and can only be obtained through gaining a debug item via "g gain leafeon" in the debug console

- Changes

- Save data is handled slightly differently now. Overall, save data should now reset much more properly but also retain data just as well, such as the unlocks.

- The color of Eevee and every evolution's nose has been changed to a dark grey to accomodate for the nose originally being the same color as the outline, which would result in the new side nose looking strange.

- Umbreon's color palette was changed again. The darker shades are now slightly lighter.

- Bug Fixes

- Espeon and Umbreon can no longer be unlocked by killing Satan/Isaac on any floor

- Unlocks are no longer finnicky in whether they actually unlock or not, and for appearing every time you beat the required boss for every new game session.

- Fixed any issues relating to emoticon priority

- Fixed any issues relating to the Sun and Moon beams not spawning.

- Fixed some unproper shading on one of Umbreon's ears.

- Additions

- Flareon, Jolteon, and Vaporeon have brand new moves! They use Flare Blitz, Charge/Discharge, and Aqua Ring respectively.

- Proper unlocks! You must now defeat specific major bosses/boss rush in order to unlock the eeveelutions. Unlock paper sprites done by Kaltriv and achievement functionality by piber20's mod helper.

- Upon starting your first run of the game session as Eevee, a special appear animation will play!

- Brand new Boss Vs. Player Portraits, one for eevee/each eeveelution including shiny variants! Sprites created by orisghost.

- Sanio has been re-added as an optional alternative to Eevee. Sanio acts exactly like Eevee with the only difference being sprites. Evolving will not give you any different looks, as it's only for Eevee. Can be gained through the debug console.

- Emoticons will now display transparently for a short period of time when they update.

- There are now short "instructional" emoticons for when you first gain an Eeveelution which will teach you their moves!

- Jolteon has a brand new animated tear sprite and tear splash for their new move in place of needles: Electro Ball! Sprites created by Kaltriv.

- Light Screen will be now be placed in front of you depending on your firing direction when you release the chargebar.

- Upon death, a text box will appear below you stating "EEVEE", or whatever eeveelution you are, "fainted!"

- Changes

- Flareon's tears no longer have a chance to leave fire on the ground.

- Jolteon's tears no longer have a Jacob's Ladder effect or use a tiny needle as its sprite.

- Jolteon's stats have been changed to be more balanced

- Vaporeon's tears no longer has a chance to leave large pools of damaging creep.

- The sprite for the Maximum Happiness emoticon that indicates you to go to the Devil/Angel room has been changed to be more recognizable as such.

- Light Screen has a larger radius for reflecting projectiles, looks slightly bigger, and uses the player's tear flags and damage. Additionally, it will not go below 3.5 base damage.

- Dark Pulse has a slightly weaker knockback for enemies.

- Holy Mantle is now a special exception when clearing costumes since it's the only indication for when the item is in use.

- Eevee now has a new character selection sprite, courtesey of Sevenut.

- Bug Fixes

- Fixed Espeon's Psywave tears not rotating correctly

- Fixed Eevee's Swift Star's splash not alligning correctly when landing on the floor.

- Fixed Umbreon's Shadow Ball SFX not replacing the default tear sfx when the tear lands on the floor.

- Fixed retaining Eevee's stats and your last-used costume when reviving as another character.

- Fixed various issues related to things happening on death and not resetting when revived as Eevee.

- Fixed any sprite inconsistencies between the normal and shiny variants

- Made it so Head of the Keeper takes priority when playing as Jolteon or Umbreon. Previously, the tear shrunk in size substantially.

- Fixed Fire Mind making Flareon's tears invisible.

- HOPEFULLY fixed any issues related to Umb/Espeon's chargebars not working and emoticons not showing up when expanding the map (Seriously this never happened on my end and I can only assume it was something I screwed up on when uploading the mod. It should be fine now)

- Every character sprite has been made from scratch for better looks and consistency!

- Additions

- Eevee, Flareon, Jolteon, and Vaporeon all have brand new fur/needles/neck fins respectively. These changes were made as the original sprites were kind of cheated to make them fit.

- Eevee and Flareon's body animations have their arms sticking out of their fur. Jolteon and Vaporeon don't have this as their "scruffs" are sturdier and above the arms.

- Eevee has a brand new tail sprite which also comes with its own smoother animation when walking up.

- Flareon given a new simpler side-view tail

- Changes

- Eyes are symmetrical, making the sprite somehow even cuter.

- Vaporeon and Umbreon's color palettes were changed slightly.

- All sprites given a "centered" shading like player sprites should have instead of heavy shading on one side, looking better overall.

- Only noticable in the files, but how the flight sprites are done in the animation files is entirely different. Take a look if you're curious as to how it's done!

- Changes

- Slightly nerfed all happiness values

- Bug Fixes

- Fixed starting stats with the Oxy and/or Belle mod installed

- Bug Fixes

- Fixed getting Eevee's costume when continuing a run as any character

- Fixed Espeon not playing any hurt sound effect

- Polishing Update

- The Umbreon/Espeon update was mostly good in its main features, but some unproper balancing issues and some bugs surfaced alongside due to somewhat of a rush to get it out. This update cleans up (most) important bugs in the update while also getting some cool additions!

- Additions

- Umbreon now has shiny markings on their legs! This was supposed to be the case initially but I forgot to add it to the body costume.

- Unique tear variants and sfx! Flareon and Jolteon have been given some sfx, and Umbreon and Espeon have been given unique tear sfx AND sprites! Note that Espeon's sprite does not scale due to the way the tear was made, so it'll always stay the same size.

- Any items/pills that would add/change your costume now properly works with Eevee.

- Keys and Bombs of all types now give Happiness!

- Compatibility with the No Costumes Mod! I mean there's no point to having it on while playing as Eevee since literally every costume has been put on the whitelist but I went and did it anyway.

- Changes

- Everything that previously added Happiness has been buffed in value! It should be easier to gain max Happiness now.

- Changed the amount of Happiness that coins give.

- When starting a run as shiny, you get a sparkle effect on Eevee!

- General improvements to code.

- Bug Fixes

- Vitamins work properly, and on all characters! Enjoy the stats.

- Fixed Happiness Emoticon not appearing when expanding the map while playing on a controller.

- Fixed coins not adding the proper amount of Happiness when there's coins of different types in the same room. It would previously increase the value based on the lowest valued coin in the room.

- Fixed your costume being reset upon exiting the game and continuing a run as Eevee.

- Fixed Flareon's ears being spread apart too far when firing upwards.

- Bug Fixes:

- Fixed the Fire, Water, and Thunder Stones showing up in runs with characters other than Eevee.

- Fixed the faint sound effect not playing

- Changes:

- Made the sfx for taking damage and dying replace the original sounds much more frequently. This means less instances of hearing the original sound.

- [/list]

- 2 New evolutions: Espeon and Umbreon. Increase your happiness through various means (which can be tracked by holding the map button. TAB by default) and head to either the Angel or Devil room to touch a beam of light and evolve into the appropiate evolution.

- Vitamins that increase your stats! There's one for every stat. Find them in the treasure room or the shop.

- Flight costumes! No longer shall you walk in the air. Don a modified version of the Sky Dash vehicle from Let's Go Eevee upon picking up any flight items.

- Shinies! You have a 1/10 chance to start a run as shiny. This also affects the evolutions too, and even the flight costumes!

- DEBUG ITEMS! Type "g gain" or "g remove" in the debug console in order to change what eeveelution you are and if you are shiny or not.

- All main head sprites have been modified. More specifically the nose has been made smaller and ears are more detailed and closer together.

- The way evolution works have been changed and now extremely streamlined. It's now truly impossible for you to evolve into any eeveelution if you are already one (with the exception of the debug items, which force it)

- Evolution stones SHOULD now show up 3x as much in all item pools! You're welcome.

wow this is so good thank you for this mod
can you make it a .zip file? i can't open .rar files... and if you can't do that, can someone tell me how to open a .rar file for a mod? (i'm 12 btw)
very cool
I like how all chracters are balanced and fun to play
January 16, 2020 - 6 months ago

Maintenance complete! We have moved to a new web server! Speed and stability should be improved. If you notice any issues, please mention them in our Discord server.