For me:
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Super Robot Wars (Gameboy)
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Berserk Millennium Falcon Arc: Chapter of the Holy Demon War (Mouthful, PS2)
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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.
Oda keeps flipping a coin to decide if he should write a really good chapter today or do some insane shit. I hate that the mf can't just write about cool pirates, and instead decides to say something shitty or draw nami with bigger booba and legs that go ALLLLLL the way up