"D-d-don't get me wrong, I'm not doing this because I like Mikoto or anything."
Is the Kamachi-sensei being Tsun here? That's a pretty subtle hint in that line.
Gremlin have their sights set on Hawaii, maybe Pearl Harbor. In WWII, Japanese planes bombarded Pearl Harbor in order to frighten the US into staying neutral during the war, but the US did the opposite and officially joined WWII and allied with UK, Russia, and etc..
....Enough of the history lesson for now. Just going to Hawaii is a very symbolic gesture by Gremlin. Gremlin probably wants fame so they can attract all sorts of destructive magicians from around the globe.
It would be interesting if Fiamma had a robotic arm instead.
P.S. I really want to know what that beast heroine girl was! That part was so random.