Sagara Sousuke of FMP and Van Fanelia of Escaflowne. Both piloting important, one-of-a-kind mechs that depend entirely upon their state of mind to operate at full capacity.
Here's the fun part: Allen, Van's rival for Hitomi in Escaflowne, has the same voice as Kurz Weber, Sagara's best friend and general goof-off counterbalance in Full Metal Panic.
Also Hitomi of Escaflowne and Haruhi Fujioka of Ouran High School Host Club. Which makes good sense, actually.