Birthright

Birthright is a passive item added in The Binding of Isaac: Repentance.

Effects

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Issues: Some of the Birthright effects are not yet implemented. Until a new version of the game is out, use the talk page to discuss instead of inserting uncertain information.

Gives a unique passive ability that varies from character to character. The effects enhance the characters' special traits.
Characters whose effect is not yet implemented means the item does absolutely nothing if acquired. It can still be marginally useful for e.g. rerolls with D4 or sacrifices with XVII - The Stars?.

Character	Pickup Quote	Effect
Isaac	More options	All new item pedestals cycle between two options. Previously-seen items are unaffected.
Magdalene	[Currently unimplemented]
Cain	[Currently unimplemented]
Judas	[Currently unimplemented]
Dark Judas	[Currently unimplemented]
???	Stronger spirit	Soul hearts gained from health ups will be doubled. Health down pills will remove 2 soul hearts instead of 1, however.
Eve	Forever cursed	Whore of Babylon is active regardless of health and Dead Bird is active without taking damage.
Samson	Rage up	Bloody Lust can gain 4 more damage boosts at the same +0.2 intervals, for a new maximum total of +14.0.
Azazel	Wide breath	Azazel's Brimstone beam becomes much wider like Mega Blast, with 2x larger collision area. No effect on damage.
Lazarus	Come back stronger	No direct effect, the item is triggered if Lazarus dies and becomes Lazarus Risen.
Lazarus Risen	Temporary DMG up	Grants a slowly fading +21.6 damage bonus.
Eden	???	Spawns 3 random items from random item pools. Only one can be taken.
The Lost	Better destiny	Prevents items with the internal tag `nolostbr` from spawning. In practice, this automatically rerolls most items that aren't beneficial to The Lost, namely ones that only give health, flight, and/or spectral tears or activate upon taking damage.
Lilith	[Currently unimplemented]
Keeper	[Currently unimplemented]
Apollyon	[Currently unimplemented]
The Forgotten	Unchained	The Soul is unchained and free to move. It can leave The Forgotten behind and leave the room, and switching back teleports to the skeletal body even from hostile, closed rooms.
Bethany	Conserve your faith	Activating an item using soul charges is sometimes free.
Jacob and Esau	What's yours is mine	The character who picks up the item gains copies of three of the other character's passive items.
Tainted Isaac	Inventory up	Adds 4 more slots for passive items. Does not consume a slot itself.
Tainted Magdalene	HP up!	Adds 1 more red heart that doesn't drain.
Tainted Cain	Salvage	The amount of pickups spawned from collecting an item is doubled.
Tainted Judas	[Currently unimplemented]
Tainted ???	Poop up	Increases the maximum number of carried poops to 29.
Tainted Eve	[Currently unimplemented]
Tainted Samson	Unstoppable force	The berserk timer gains 3 seconds instead of 1 when Tainted Samson kills an enemy.
Tainted Azazel	Stronger sneeze	Doubles the size of Tainted Azazel's Hemoptysis sneeze attack.
Tainted Lazarus	[Currently unimplemented]
Dead Tainted Lazarus	[Currently unimplemented]
Tainted Eden	Eternal	Items gained before Birthright will not be rerolled, either by taking damage or by items such as D4 and Missing No., and base stats become locked to what they were at the time of pickup.
Tainted Lost	Extra life	Grants an extra life that revives Tainted Lost in the same room and deals 200 damage to nearby enemies. It can hit the same enemy multiple times.
Tainted Lilith	[Currently unimplemented]
Tainted Keeper	Money money money	Strongly attracts the coins dropped by defeating enemies from a short distance. No effect on other coins.
Tainted Apollyon	[Currently unimplemented]
Tainted Forgotten	Recall	Tainted Soul gains the Recall ability, to retrieve the Tainted Forgotten automatically from a distance.
Tainted Bethany	[Currently unimplemented]
Tainted Jacob	[Currently unimplemented]

Trivia

This item's name and unlock requirement are likely a reference to the biblical story of Jacob and Esau, in which Esau trades his birthrights to Jacob in exchange for stew. The reference is strengthened by the Birthright's specific effect when taken by Jacob or Esau, allowing them to "inherit" the items of their brother.