Simon Dark is a creature similar to Frankenstein's monster in that he's made from stitched together pieces from the bodies of 20 boys by a desperate medical genius who is part of Geo Populus. His face and size reveal that he's approximately 17 or 18 years old, but he usually wears a mask to cover it. Simon doesn't know who he is or how he got to where he is now. He can remember everything he's ever read or seen, but he can't remember his past. He lives in the remains of an old, blown up church with his pet cat and things he's scavenged.
Simon clearly suffers from amnesia and protects a neighborhood in Gotham called "the Village". Those who live their are glad to have him as a vigilante even though is appearance. He was created to defeat the same cult that created him. Sometimes he's scared, confused childish and doesn't know all his powers. His familiars are three strong shape-changing servants who he freed from the cult. He stole Rachel Dodds' book but later saved her from a serial-killer and is an ally of Tom Kirk.
Simon is very stealthy, often appearing behind enemies without them knowing it. He is also exceptionally agile and strong for his size. Though Simon walks and talks like a normal person, he may be just a living corpse. He was able to travel across Gotham's rooftops shortly after being shot repeatedly by police and pronounced dead by a coroner, so he probably doesn't react to physical trauma the same way other people do. However, he was not totally unharmed by the shooting, so exactly how his body works is unknown. He exhibits some super-human abilities such as enhanced speed, agility and strength. He also states that he remembers everything he reads, which implies he may have a photographic memory. Uses vaguely-defined occult superpowers that are used only once because he hasn't got their fully knowledge and control. He also read minds, pasts and futures by touching people and can change his face. Resurrects people by sacrificing one of his 20 souls and controls supernaturalism in Gotham. Casts rituals to allow him to see other places and the future, transport himself and others to other dimensions. He's got a bit of telekinesis.
Simon Dark is named after a children's nursery rhyme popular in Gotham City.
"Lurks in the shadows. Hides in the park.
Simon. Simon. Simon Dark.
If you're good he'll stay away.
If you're bad he'll make you pay.
Lurks in the shadows. Hides in the park.
Simon. Simon. Simon Dark."