Most Helpful Girl
Cowboy Bebop and Neon Genesis spring to mind immediately. Those are both supposed to be very good. Parasyte: the maxim could be considered sci-fi possibly... I mean, it has aliens coming to destroy the earth so it fits that aspect and it's a very good anime, you could check that out. Gundam wing is another sci-fi mecha anime, similar to Code Geass in terms of the huge robots.
Most Helpful Guy
Try BBK/BRK (Good), GATE, Anti-Magic Academy, Irregular at Magic High School, Is it Wrong to Pick Up Girls in a Dungeon (not scifi), Ars Nova (one of my faves) God Eater (also good).