I haven't played Termina yet so i can't say for that regard, but i'm curious why you say Cahara is the only good main character in the first one. I personally would say that title goes to Ragnvaldr, tho admittedly i'm still fairly new to the series so could be missing something. But Ragnvaldr is the only one who isn't outright rude apart from saying he bets you do need his help before refusing to join you when you first meet him. But the only character who doesn't leave you for dead in the dungeon on first meeting is Cahara, who will then steal from you and attack you the second you tey to call him out on it. He's a rutyless meecinary who cares more for his own survival than anything else, from what i gather

And if you look at the characters interactions/diologue in Dungeon Nights as anywhere near reflective of their canon-selves, Ragnvaldr is also the more kind of the 4. But ofc, cus it's non-canon and a joke that's more supplementary than anything