Alright, so 'Imawa no Kuni no Alice'? That's the manga version of the story, 'Alice in Borderland'. The main crew is pretty tight-knit. You've got Arisu, the central guy who's smart but initially kind of aimless. His two best friends, Karube and Chota, are super important—they ground him and their fate kicks off the whole drive of the story. Then Usagi, the climber girl he teams up with; she's all about survival instinct and becomes his partner.
There are these other players who become major, like Kuina, the transgender martial artist, and Ann, the doctor. On the 'game master' side, you have the enigmatic Hatter running the Beach, and Mira, the Queen of Hearts, who's behind the final showdown. The characters are really the heart of it—it's less about the crazy games and more about watching these broken people find reasons to live again.
I always found Chota and Karube's exit way more impactful than any of the big twists, honestly.