Abyssal Charm trees should be built in a similar way to Infernal ones. Each should be focused on a specific type of Abyssal to emulate. There should be the vampire tree, which is all about drinking blood and gaining various benefits from the process thereof. There should be the tree for being the Frankenstein monster, all about replacing parts of yourself with a variety of corpses to become a better monster. There should be the the mummy tree, which makes you able to inflict horrific curses on people who defile your sacred sites. There should be the slasher zombie tree, about being an unstoppable murder machine. There should be the dream wraith tree about haunting people in their sleep and driving them to suicide or madness.
And yes, as
@EarthScorpion says, there should be the tree about being the revenant who has come back from the dead to pass judgement on the living.
The trick, I think, would be that while Infernals have huge sprawling trees that are mostly meant to be self-contained I think Abyssals should have small trees each based around a specific horror movie archetype. Then you can mix and match much more easily to create
your vampire, with some flavor of banshee and grim reaper and poltergeist thrown in. Maybe, say, five to ten Charms for each archetype tree, just enough to give a variety of effects from Essence 1~5 but not enough to be the entire character.
Monsters tend to swap and trade gimmicks much more frequently than supervillains. You get fast or slow zombies, bestial or sophisticated vampires, sexy or horrifying ghosts and so on.