Bethany

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Bethany (nicknamed Beth) is an unlockable character added in Antibirth. Any Soul Hearts, Black Hearts, and immortal hearts that Bethany picks up are added to a counter instead of her health bar. This counter can be used as a charge for the Book Of Virtues or other activated collectibles. Each heart picked up increases the counter by 2. She has a chance of dropping a Soul Heart on room clear, separate from the regular room clear drop.

Bethany is unlocked by having any combination of 12 soul, black, or immortal hearts during a run with any character.

Tips

 * Since red hearts cannot be protected, any hit will destroy your chances for a Devil/Angel room, making Goat Head more valuable than ever.
 * Alternatives are protection items like Gnawed Leaf, Breath of Life, Infamy, or Holy Mantle
 * Items to evade projectiles like Pluto, Broken Watch, The Hourglass, or The Soul; or obstacles like Callus
 * Because Bethany only has red hearts, Blood donation machines can be very dangerous to use unless she has more hearts saved to replenish the lost ones. (Same applies to any damage triggered item, Devil pacts, and the Devil Beggar).
 * Since the spirit flames from her Book Of Virtues counts as familiars, they are affected by BFF! and Song of the Siren, making them more powerful.
 * The tears shot by these flames travel through obstacles, allowing you to attack while hidden behind one.
 * You should think before taking a Devil's deal, since the Book Of Virtues increases the chance of getting an Angel room, even on Floor 2, and a deal will remove this benefit unless you get Act Of Contrition.
 * Blood Oath will take most of your red hearts at the start of every floor. It is not recommended to take unless you have a very reliable dodge skill or health source.
 * Dark Bum will take every red heart and convert them to Soul hearts, so you'll sacrifice health in exchange for an item charge.
 * The "Soul charge" is exclusive from Bethany, not the Book Of Virtues, so you can use the counter on other active items, but items with long charges (for example: The Necronomicon) can drain it very quick (Remember the Book of Virtues only has two charges).
 * Whore of Babylon only actives on the half of the last heart, meaning that Bethany must be at the very verge of death to benefit from it.
 * 9 Volt will always charge the first bar, allowing you to save hearts from the counter.

Unlockable items
Note that defeating Mega Satan does not unlock anything or give a completion mark.
 * Beth's Faith - Complete the Boss Rush
 * Blessed Penny - Defeat ???.
 * Soul Baby - Defeat Mom's Heart or It Lives on Hard.
 * Urn of Souls - Defeat Satan. (Glitched)
 * Alabaster Box - Defeat The Lamb.
 * Book Of Virtues - Defeat Isaac.
 * Revelation - Defeat The Witness. (Glitched)

Trivia

 * The name Bethany could be a reference to the village of Bethany in the bible which is home to Lazarus.
 * Bethany was confirmed by _Kilburn to originally have orange hair in early concepts, similar to Lazarus's hair.
 * In Repentance, Bethany is unlocked by beating Mom's Heart or It Lives! as Lazarus on hard mode without losing a life.