Leo is a passive item.
Effects[ | ]
- Isaac can break obstacles by walking into them.
- Increases Isaac's size.
This item belongs to the Stompy set. Collecting three items from this set will transform Isaac into Stompy.
This item belongs to the 
Notes[ | ]
- Walking into Bomb Rocks will cause them to explode.
- Mushrooms may hurt Isaac with a poison cloud if walked into.
- Polyps may hurt Isaac with blood shots or red creep if walked into.
- Flight does not prevent the effect from occurring.
- Holes in the ground can be filled if Isaac walks into adjacent rocks from the right direction, similar to bombs.
- TNT Barrels will not be destroyed or explode on contact, however Movable TNT Barrels will explode and may deal damage to Isaac if walked into.
- Allows Isaac to walk over and destroy Red Poop without taking damage. Isaac will still take damage if he is standing on it when it reforms.
- Walking into an Angel Statue in the Angel Room will trigger the boss fight, and Isaac will take damage as the Angel spawns on top of him.
- Nullifies effects of One Makes You Small pills, One Makes You Larger pills, and other items which decrease size, such as Caffeine Pill and Binky.
- Spiked Rocks can be destroyed, but depending on Isaac's size, angle and velocity they may still hurt him.
Nullifies effects of One Makes You Small 
In-game Footage[ | ]
Trivia[ | ]
- Despite increasing size, Leo does not contribute towards the Huge Growth unlock.
 Zodiac Signs
|
|---|
| Items |
 The Binding of Isaac: Rebirth
|
|---|
