Things are looking decent here. Just a note for the final apps: remember that your characters are Planeswalkers. I don't ask for much in the bio, but how they ingited their Spark, and how other Planes have influenced them and their magic should be noted. Don't feel the need to cram every possible influence on your character's colors into a single Plane, for that reason.
I would say this about your character, though, MarsAdept. Nothing really against it, but I'd find it more, hm, "streamlined," were he just a knight for the Orzhov who learned Red magic on other Planes, or something along those lines, rather than separately joining three different guilds. Just my take on it, if that's not how you want to play, that's fine.