Folken Fanel. The Troubled But Cute strategos of the Zaibach Empire. He is mysterious, sexy and troubled as hell which leads to both canon and non-canon attempts of healing his troubled heart. (And to further emphasize the point: This troper is a guy. Who hadn't even considered/realized that he wasn't 100% straight until he saw Escaflowne.)
A cute, possessive-aggressive catgirl in an undefined possibly master/pet relationship with the lead character, who tends to respond to worry by tackling him, throwing herself atop him spread-eagle and dragging her tongue across his cheek? Not to mention her attitude towards the legitimate object of lust, which at times becomes so incredibly jealousy-tainted that it takes on shades of sexual tension? So, so fetish fuel.
That voice adds so much, too. Minami Takayama works wonders. Also, something could be said for the Dragonslayers in general and their full-body black leather treatment. Rawr.
Movie Dilandau gets tortured, rendered helpless, inserted with implements of magical doom, and overall just provides excess amounts of Fetish Fuel. Did I mention that after a certain point, he's in a mech in nothing but brown panties? Because after a certain point, he's in a mech in nothing but brown panties.
Later on, it's revealed that he's actually Allen's little sister somehow or another transformed into the exact opposite of herself, meaning that she went from a sweet, kind, loving girl to a power-hungry, combat-obsessed, at least mildly pyro boy who hurts people he's fond of. The best part? S/he can still change back.