Lil Delirium is an unlockable familiar in The Binding of Isaac, added in the Afterbirth+ DLC.

Spawns a familiar that transforms into another random familiar every 10 seconds. The familiar will take on a Delirium-like appearance, but otherwise has the same stats and behavior as the non-Delirium counterpart.

Can transform into the following familiars:
• Acid Baby
• BBF
• Big Chubby
• Bob's Brain
• Cube of Meat (level 4)
• Dry Baby
• Farting Baby
• Fruity Plum
• Headless Baby
• Hushy
• Incubus
• Isaac's Head
• Lil Brimstone
• Lil Gurdy
• Lil Haunt
• Lil Loki
• Lil Monstro
• Little Chubby
• Little Gish
• Robo-Baby 2.0
• Seraphim

Can transform into the same familiar multiple times in a row, thus keeping the same form for more than 10 seconds.

The familiar can damage Isaac when taking the form of BBF or Bob's Brain.

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.

This item contributes towards the Conjoined transformation. Collecting 3 items from this set will make Isaac shoot in 3 directions at the cost of -0.3 damage and -0.3 tears.

Lil Delirium can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Lil Delirium 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.

Lil Delirium

• Familiar that mimics the forms and attacks of many other familiars. Shifts to a new form every 10 seconds
• Abyss: x1 glitched locust .75x Isaac's damage

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