Kagain

Kagain is a greedy dwarven merchant and fighter living in Beregost. He's somewhat antisocial and mostly concerned with making money, to some extent also drinking beer.

In Baldur's Gate, the player character can encounter Kagain in his (difficult to find) place of business in Beregost. He wants to hire the player's party to find some lost caravans and will join them to do so if this is agreed upon. Shortly, however, he will state he is bored with the whole deal and decides that he's willing to go along in doing whatever the player character was otherwise doing, possibly in hopes that it will prove lucrative.

Kagain's most notable feature is his extremely high Constitution that allows him to regenerate.