This one took a little more refinement. I had an idea for a hero with an odd shaped mask that I reasoned would be due to his alien heritage, but it took some refining to get it onto the page.
For the Visitor, I decided to try and implement several notions of "alien" looks into his overall design, while still retaining the superhero elements. His mask would have odd shaped eye holes, and would be oddly shaped, to hide the fact that he isn't human underneath the mask. The three fingered hands and feet would help with that. For the coloring, I was initially thinking about red, blue and gold, but I decided to make it a shiny silver and gold so key back into that "Little Grey Men" concept we have for aliens. For the cape, I wanted something that looked less like the big, flowing starchy capes that I've done in the past, and something more like tinfoil or something out of a 50's sci-fi or alien invasion movie or show.
For his powerset and history, I see the Visitor being an alien from another planet that fell in love with Earth and it's culture, and decided to use his abilities to help protect the planet. He'd have great mental powers, including powerful telepathic abilities, augmented by his culture's technology, that he would use to pass off as typical feats of superhuman strength, flight or invulnerability. He'd wear a costume in order to make it seem like he was more of an enhanced or mutated human rather than an alien.
Overall, the design may be simple, but I think it says "alien" at the same time is says "hero."