Challenge 37 also unlocks one of the best trinkets in the game, so do that too. At the character selection screen, press to enter the following code. Edith is not unlockable, because she was cut due to balancing/design issues! Edmund McMillen's favorite character from, When unlocking Eve, gaining Red Heart containers or using, Eve works well when she's low on health using, Items that take Red Heart containers away typically do so as a cost to counterbalance its potent benefits for Eve, however, this supposed cost will likely be beneficial due to Whore of Babylon.
Here's a look at all of them and how to snag them for yourself. Pretty sure you can't unlock things if you use seeds. I think I counted about 80 or so trinkets in the game as of this expansion and trinkets aren't the most common thing you can find.
