For me:
-
Super Robot Wars (Gameboy)
-
Berserk Millennium Falcon Arc: Chapter of the Holy Demon War (Mouthful, PS2)
-
Gundam Battle Assault (PSX)
I love Super Robot Wars, it's the perfect you got peanut butter in my chocolate game. It mixes a dozen different giant mecha ips into a tactical roleplaying game.
Berserk on the ps2 is awesome. It takes the musou formula but imo makes it something much more engaging, plus it faithfully retells the best arc of the manga.
GBA is a great 2D fighter by natsume, carries on the tradition of the gundam wing game for the super famicom but this time on a 32bit system.
Trying to pick ones that are games directly based on anime.
Pokemon Yellow
Jojo's Bizarre Adventure - Arcade/PS1/DC
Yugioh Capsule Monsters - PS2
.Hack games are kinda' multimedia with the anime, not sure if they count.
I'd count them since it's based on a show.
I think the games were supposed to be the "main" part of it, but they were bundled with OVA episodes! They totally count.