Alec Swan
In one universe, Doctor Alec Swan was a loathsome necromancer, and a nemesis of Morrison Moore.
Swan was immortal, being able to resurrect himself in a new body (identical to his old one) every time he died, posing as his own descendant and having his previous body buried in a private graveyard occupied entirely by his incarnations. His earliest known incarnation (though certainly not his actual first life, considering the number of graves in the cemetery) lived from 1756 to 1759. A later incarnation had better luck, becoming both a husband and a father until his death in 1930. His successor, however, died in 1976 as a “hated necromancer” (according to his epitaph). His second-to-last body died in 2012, being hanged for the crime of necrophilia.
Swan was able to return from the dead one final time, but this was discovered by Chief Inspector Howie, who sent Morrison Moore (an independent investigator and adventurer who had faced Swan before) to the graveyard to head him off. There, Moore bumped into Jenny Everywhere, who had just shifted into this reality. The two found Swan in the process of romancing a cadaver. Irate at the intrusion, Swan used a Greek incantation to raise his previous, skeletal bodies as an army of undead minions, and sicced them on the two interlopers. The undead Swans killed Moore, but Jenny grabbed hold of his gun and shot the living Alec Swan through the forehead, bringing an end to his evil. (COMIC: Graveyard Shift)