Guppy is a transformation in The Binding of Isaac.
Obtained by acquiring any 3 items with the guppy tag.
Grants Isaac flight and spawns a Blue Fly 66% of the time when a tear hits an enemy.
This page shows information as of the latest Repentance release.
To see latest up-to date information about this transformation for the new Repentance+ (Online Co-op) DLC, check this page instead.