Kotarou's nickname is "Kotarou the Runner".  He's a master of defensive battles, and minimizing losses when things turn bad.  His quiet, unassuming nature and the way he fights make him less likely to stand out than his other friends.  However, if he was put up against a real foe, someone who he couldn't beat unless he gave up on running, you might just learn his true name...
we'd rather stand on the bodies of 
our enemies than stand on the moon!
فنحن نفضّل الوقوف على أجساد 
!أعدائنا على الوقوف على القمر
prefiero sentarme sobre los enemigos
que derroto, y no sobre la luna.
preferimos ficar nos corpos 
dos inimigos que estão na Lua!