Name: Leonid Kravos, the Nightmare
Aspects:
High Concept: Sorcerers Ghost
Trouble: Driven By Vengeance
Other:
Something to Prove;
The Nightmare;
Plenty Of Minions;
In Your Dreams;
Good At Nothing But Hurting People;
Skills:
Great: Lore, Discipline, Intimidation, Presence,
Good: Conviction, Deceit, Empathy, Fists,
Fair: Alertness, Contacts, Investigation, Stealth,
Average: Burglary, Endurance, Rapport, Scholarship,
Powers:
Evocation [3]
Ritual: Diabolism [2]
Lawbreaker (First) [-2]
Lawbreaker (Fourth) [-2]
Spirit Form (Poltergeist) [-5]
Swift Transition (No Mortal Home) [-1]
Physical Immunity [-8]
The Catch is standard ghost stuff [+2]
Mimic Form [-2]
Mimic Powers [-4] [While Mimicing Harry, his Ritual becomes full Thaumaturgy, he gains the Sight and he gains a level of Refinement, and his Conviction becomes Superb. Stats shown below include these bonuses.]
Total: -27 Refresh
Specializations:
Evocation: Elements (Air, Fire, Spirit); Power (Spirit +1),
Thaumaturgy: Control (Psychomancy +1), Complexity (Psychomancy +2);
Stress:
Mental: OOOO (+1 Minor Consequence)
Physical: OOO
Social: OOOO
Armor: By spell or item effect.
Judging by Harry's judgment of Kravos as a magical hack I didn't think he warranted full Thaumaturgy. It's possible Diabolism is the wrong name for the variety of Ritual he has, but it's basically some summoning of nastier critters and transformation and disruption to mess people up (including mentally). It's only good for hurting people, as per Harry's description of Kravos.
Eating Harry's magic, per my interpretation, gave him the same powers as Harry (Thaumaturgy, The Sight, and Refinement)...but not necessarily the same specialties or uses, those being based on his own proclivities. Just like eating Kravos's magic back improved Harry's own proclivity for hurting things...specifically his fire magic.
This version also keeps Lawbreaker, basically because why not? Doesn't seem like becoming a ghost would make you worse at that stuff. You can't gain an new Lawbreaker stunts as a ghost, but you keep what you've got, IMO.