I know you've talked about it before, but it was rather short and I'd like to know more about the powers of a Heir of Life!

Hmm, let me see! Heir of Life, they would be influenced and influence others, through Life, which makes it likely they’d be from an influential or rich family/status. Jane is actually forced into the role of a Heir for quite a long time in the comic, with a Thief of Life stealing her Agency and trying to Change her into someone that would one day Inherit Condy’s empire. 

Power-Wise though, the ability to manipulate Life, we see the Witch of Life healing, so the Heir would likely be able to Heal as well. Manipulating Life also sounds like the ability to have animals or plants come to your aid, Changing Nature Itself for a purpose. They may struggle with people trying to force them to do things, but they may be bound to free themselves and assume a rather important position of power. And as I’ve talked before, if Heirs can change themselves like John does with the windy thing, a Life Heir may… I don’t know, either maybe regenerate and infuse their bodies with Life, or maybe like, poof into animals, like you’d imagine a Vampire poofing into bats.