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

Swaps between the current character and Esau Jr., a separate character that has 3 Black Hearts, +2 flat damage, and flight.

Coins, bombs, and keys are shared between the 2 characters, but a separate inventory exists for everything else (health, items, consumables, trinkets).

When used for the first time, Esau Jr. receives random items equal to the number of items the original characters has. Each item is chosen from the same item pool as the original item. Only passive items are given substitutes. Items with the quest tag and set drops (such as The Small Rock) are not counted and won't get a substitute item.

If either character dies, they will both die.

Esau Jr. will receive any passive starting item the original character had, however, if said items are rerollable, they will count towards the number of items he should get, resulting in both the staring item and 1 extra to be obtained.

Using 5 different copies of Esau Jr. one after the other, starting from the 5th copy, Esau Jr.'s jar will break and create a familiar that behaves like Abel, and deals 7.5 damage per shot but at a faster fire rate.

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 The Beast as Tainted Jacob.

Esau Jr. can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Esau Jr. 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.

Esau Jr.

• Swaps between the current character and Esau, an alternate character with flight, increased base damage, and 3 black hearts
• Upon first use, Esau is granted an item for each item Isaac holds
• Collected items and health are not shared between the 2 characters
• Dying as either character results in a game over
• Abyss: x1 locust .75x Isaac's damage
• Book of Virtues: x1 middle wisp - 2 hp - 3 damage
• Book of Virtues: Each character retains their own wisp

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