Guppy

Transformations

Guppy	Beelzebub	Super Bum	Yes Mother?	Bob	Fun Guy	Leviathan	Conjoined
Spun	Seraphim	Oh Crap	Bookworm	Spider Baby	Adult	Stompy

Transformation ID	0

After picking up 3 items from the following list Isaac turns into his cat Guppy.

As Guppy, Isaac gains flight, and when one of his tears or one of his familiar's tears hit an enemy, a Blue Fly spawns.

As Guppy, Isaac gains flight, and when one of his tears hit an enemy, there is a 66% chance to spawn a Blue Fly.

Activated Collectibles

Name	ID	Icon	Quote	Description	Quality
Guppy's Head	5.100.145		Reusable fly hive	Spawns 2-4 friendly Blue Flies that damage enemies.	2
Guppy's Paw	5.100.133		Soul converter	Converts one Red Heart Container into three Soul Hearts.	3

Passive Collectibles

Name	ID	Icon	Quote	Description	Quality
Dead Cat	5.100.81		9 lives	Sets Isaac's Red Heart Containers to 1, but grants 9 extra lives. After dying, Isaac respawns with 1 Red Heart Container.	3
Guppy's Collar	5.100.212		Eternal life?	Grants a permanent 50% chance to respawn with 1/2 of a Red Heart after death.	1
Guppy's Hairball	5.100.187		Swing it	Spawns a familiar that loosely follows behind Isaac, which blocks shots can be swung like a flail to damage enemies. Grows bigger by killing enemies.	1
Guppy's Tail	5.100.134		Cursed?	Room Clear Awards have a 1/3 chance of being replaced with a Chest and a 2/9 chance being replaced with nothing.	2
Guppy's Eye	5.100.665		An eye for secrets	Shows the contents of Chests, Fire Places, Grab Bags, and Shopkeepers before they're opened/destroyed.	2

Trinkets

Name	ID	Icon	Quote	Description
Kid's Drawing	5.350.169		Looks familiar...	While held, counts as one of three items needed to transform into Guppy.

Notes

• Technology 2 spawns flies only very rarely.
• If Isaac has transformed into Guppy, Guppy's Hairball spawns Blue Flies when it deals damage.
• If all the 9 extra lives have been consumed, Dead Cat is removed from Isaac's inventory. This causes the transformation to be removed.

Unlockable Achievements

• 

  Guppy's Hairball - Become Guppy.

• 

  Cat Got Your Tongue - Become Guppy.

Trivia

• This transformation is a reference to Edmund's first cat, as seen in some of his early videos on his personal channel.
  • Guppy the cat passed away in 2014.
• Transforming into Guppy as The Forgotten will give him the appearance of a cat's skeleton.
• The guppy item tag determines if an item counts towards the transformation, except for Kid's Drawing which seems to be hard-coded to count as a Guppy item despite not having the tag.

References

The Binding of Isaac: Rebirth
Achievements Challenges Completion Marks Items Trinkets Characters Chapters Rooms Transformations Attributes Bosses Monsters Pickups Modes Curses Objects Seeds Effects Endings
Collection Item Pools Version History Modding Music