@SbennyWhoa are you also playing Crash Team Racing(CTR)? were same sir I play that game too the most hard to play this game is to obtained Fake Crash character via collecting purple Gem.
Purely out of nostalgia I'd say Suikoden and the now barely remembered Shaolin, I don't think it was popular back then either. Harry Potter for PS1 is a close runner up though just for the goofy faces the characters had! (´。• ᵕ •。`)