I have one: a superhero and dark avenger of the night. Basically a Batman-like character who preys in the shadows using gadgets rather than powers. However, this superhero doesn't leave apparent their gender (could be a man or a woman under the costume, though it's not bulky armor--maybe the chest is bulky from kevlar being placed there) or race. The costume should leave room for martial arts, while still big enough to be imposing.
This is for a comic I wrote but never designed the central character. The first three issues follow the investigation into who this superhero is.