when are we gonna get an edgy healer class?

[Anova]

From a roleplay perspective, necromancers might justify as edgy healers. Yes, they largely raise up armies of the dead and are evil, but that could also mean they're adept at handling and manipulating life force as well.

It depends more on the lore if you actually consider undeath to be some form of evil, dark energy gathered from the void or just some applied use of life magic.

In FFXIV, we see skeletons and the like animated by Void, but we also have Nald'Thal, who is a twin god that represent life and death. That lore should make a suitably edgy healer if you want to build it out that way. There's even a story line involving Sil'dih and Ul'dah about zombie powder you could potentially use for some angst-ridden adventures.

That is probably the closest we will get to an "edgy" healer focused on revenge or at least "proving innocence".

Another part of me is just amused by the thought experiment of playing a healer who reanimates spirits of the dead to serve as their party members. It gives a completely different interpretation of where healers actually find their "friends" for 4-man or 8-man content, and what the Warrior of Light actually does in the story.

It's a bit of a stretch, but you could make an argument to build out a puppet master this way, where they manipulate the dead as puppets and "heal" them to make them function like undead (healing through reinforcing with magic, immune to many status effects through buffs, etc).