Gello is an unlockable active item in The Binding of Isaac, added in the Repentance DLC.

Spawns a familiar that's attached to Isaac, and can be controlled in the direction Isaac is shooting. While Isaac is shooting, the familiar will shoot at the closest enemy.

The familiar inherits Isaac's damage, tears, range, shoot speed, tear effects, and tear modifiers.

Launching the familiar deals 3x Isaac's damage to enemies it hits.

Gello's tears deal 75% of Isaac's damage, or 100% if playing as Lilith or Tainted Lilith.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.

Defeat Delirium as Tainted Lilith.

Gello can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Gello have been documented.

* Note that not all possible synergies and interactions are listed here.

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

Gello

• Spawn and throw a fetus familiar attached to Isaac by an umbilical cord
• The throw deals heavy damage on impact, and while active the fetus' movements and shots mirror Isaac's directional attacks
• Abyss: x1 locust 1.5x Isaac's damage
• Book of Virtues: x1 middle wisp - 2 hp - 3 damage
• Book of Virtues: Wisps orbit Gello while active

• Check out the item description on the external Isaac Wiki.