I am very into anime, so I play most games in Japanese that offer it just because I like hearing voices I recognize. Daemon x Machina having Char and Amuro’s voice actors is great content.
I have to second Majima in the Yakuza games. A really stellar performance. I also really like the Japanese performances for the Kingdom Hearts series, especially Organization XIII. If you are a fan of those games and have only seen it in English, I really recommend watching a Japanese cutscene movie sometime. Keiji Fujiwara (RIP) as Axel is an especially strong performance.
This one is cheating a little, but sometimes good voice acting comes from having fun - and Saiou in Yu-Gi-Oh! Duel Links is very fun. He’s a villain from Yu-Gi-Oh! GX whose ace monster is Arcana Force XXI - The World and he is voiced by Koyasu Takehito. Coincidentally, a few years later, Koyasu voiced DIO in JoJo’s Bizarre Adventure, who is a villain that has a power called The World. But where Saiou was usually calm, DIO… was not.
So when they called him back to do the mobile game, they leaned into it.
And a couple of English ones. Jack Brand as Jack Baker in Resident Evil VII is fresh on my mind since I played it last week, but his delivery of “Nice car, Ethan!” is the sort of thing I’ll quote constantly for years. And Mikee W. Goodman’s Ancient Reptilian Brain in Disco Elysium - he starts speaking over a black screen at the very start of the game, and it sets such a great mood. I knew I’d love the game before I’d even really seen it just from his opening dialogue.