Viewing Mod
Eevee is a new adorable character with 5 available eeveelutions!
Created 6 months ago

It's Eevee!

Isaac's Mom is closing in as he 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.

(If you decide to make a video on my mod, I kindly ask that you leave a link to the mod in the description. Also, if you have trouble getting the eeveelutions, you can use the debug console and type “g gain” and then the name of the eeveelution to turn into them. “g remove evolution” to go back to Eevee. Thanks!)



  • A New Character: Eevee!
  • Eevee's Speed is naturally higher, and they make use of their signature move: Swift! It isn't perfect though, as it doesn't have it's 100% chance to hit. Do the aiming yourself!
  • Damage is doubled but tears are halved.
  • Eevee has the special ability to evolve based on their surroundings, so picking up stones with magical energy imbued inside is just enough to drastically change his entire body and abilities. Find them at your local shop or in a secret cave!


  • Grab a Fire Stone to evolve into Flareon: a fiery evolution of Eevee with damaging capabilities. Evolve via the Fire Stone item.
  • Gain 1 Full Red Heart
  • Your Fireball burns anything it touches. Unlike Fire Mind, it doesn't explode in your face and the burn lasts much longer.
  • You also have a 20% chance for your Fireballs to leave behind a heated fire!


  • Grap a Water Sstone to evolve into Vaporeon: an aquatic evoltuion of Eevee with more defensive approaches.Evolve via the Water Stone item.
  • Unlike the other evolutions that have you gain you 1 full red heart, you gain 2!
  • Your Bubble attack leaves behind a small damaging puddle of water.
  • Your Bubbles have a 10% chance to contain extra water, splashing into a much bigger puddle of water that deals more damage!


  • Grab a Thunder Stone to evolve into Jolteon: an electrifying evolution of Eevee with a fast-based set.
  • Aside from a Health up, your Speed and Tears go up, but your Damage goes down!
  • You decided Swift is too slow so you use your own electrified needles to dish out quick damage.
  • Your needles [strike] are just a Jacob's Ladder effect [/strike] send electricity through multiple enemies, which is good for crowd control!

Happiness System
By collecting many items in the game and coins, or playing the thumbs up animation, you gain happiness. View your happiness by expanding the map. Once maxed (you'll see a cross and reverse cross as the emoticon), head to an Angel or Devil room and claim Umbreon/Espeon respectively.


  • Upon gaining max happiness, head to the Devil Room and touch the beam of light to evolve into Umbreon: a dark and sinister evolution of Eevee who prefers to use specialized defense.
  • Gain 1 red heart and a black heart!
  • Use a charged side-attack similar to Maw of the Void and unleash Dark Pulse: A horrible aura imbued with dark thoughts. Will knockback enemies and bullets alongside instilling fear into enemies!


  • Upon gaining max happiness, head to the Angel Room and touch the beam of light to evolve into Espeon: a psychic and calm-minded evolution of Eevee who prefers to use specialized attack.
  • Gain 1 red heart and a soul heart!
  • Use a charged side-attack similar to Maw of the Void and put down a Light Screen: A wonderous wall of light that will reflect any bullets and add homing onto them!

Planned Features:

  • Implementing the rest of the Eeveelutions
  • Rebalancing all the eeveelutions once they're all implemented (This would allow me to look at all of them at the same time and make sure all of them are equally viable)
  • A unique death animation (it would probably just get rid of the Isaac ghost)
  • 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, as the code is currently written to only detect 1 player (Suspended till Repentance)
  • A mysterious 9th Eeveelution unique to this mod!
  • Items that would have you gain each Eeveelutions' unique effects while playing as characters besides Eevee

Currently Being Worked On:

    Giving Flareon, Vaporeon, and Jolteon all new abilities!

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)
  • Umbreon's tear sfx when the tear hits something does not replace the basic tear splash sfx when it hits the floor

With all that out the way, thank you to everyone who has supported this mod! Some special thanks are described in the main.lua. Please go ahead and leave ideas for Leafeon, Glaceon, and Sylveon in the comments below! Be also sure to report any bugs in the comments below too!

This mod is also available on the Steam Workshop


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- 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.

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 - 1 month 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.