My bf swears up and down the female assassin sprite outfit looks strikingly similar to Diablo II's assassin. It surprises me for warlocks they didn't steal from Yugioh, its still pretty popular as far as cardgames go still in Japan. And not like RO hasn't been influenced by other things before either .-.
Kiel Quest for example makes me think of Mega Man X series, KIEHL GOES MAVERICK on us (people who play Mega Man X series will probably get this). Anyway, I could be looking into this too much too :o