in 'reAl-life", trance zidane might win cuz he might also steal the other guy's weapon=D

otherwise...

if cloud threw his sword at his enemy, he would win because the size of it alone owns =D

if a Squall on Aura kix in, he cOUld do it, myb, ditto for seifer =D

auron for all the fancy sake-charged bushido stuff=D

as for tidus, he could cast like s00perhaste® on himself and attack like grease on stain-able steel (?) =D

vivi could wear immune-to-darkness stuff and just cast doomsday, fin. =D

***but if all "underhanded" stuff was allowed, zidane could be fast, being a thief steal the other person's sword , get into trance somehow, zip around with crazy speed and there we have it, fin, too.=D mebbeü