super mario 64 is a staple i'd say
i play mario kart 64 the most, cuz of the multiplayer, so i would highly reccomend that.
oh and bomberman is really just fun haha. and you can play with 5 people on it!
Gates of Thunder and Devils Crush.(2 old faves from the TG16 which still play great.) Military Madness would be on my list if I dl'd it already, but I haven't yet.