These are all based on actual animations from the fighting games. From top-left to bottom-right as of AoCF: 8a, c.5a/4a, f.5a, one of the spellcards, and a victory animation
I agree with fact that all characters are part of protagonist's harem. But how it describe choosing Caelus? In my vision, all of them are Stelle's harem.
I kinda like that Darjeeling just gets associated with Captain Picard lol... Badass calm characters wearing black on the bottom and red at the top. Also: Fancy European :p
Still, I am incredibly shocked. I wasn't so sure I was going to like her character but the story quest backflipped that opinion into a garbage can. The whole cast was great.