Good call on Alex, Pilot's actually more of a Green Lantern sort of character, though the spear does denote a dragoon of sorts. They're actually an interstellar superhero brother/sister duo. Like Power Girl and Superman I suppose.
Anyway. I can see why you're so proud of this one. It really feels like a complete accomplished piece of art! The composition is gorgeous, the characters look like they fit, everything works! It's amazing! Can't wait to see the comic <3