Obito- Oath of vengeance paladin. He thinks he wants to take over the brain, but he keeps getting distracted and hit with the urge to restart whenever he reaches act 3.

Kisame- Fighter. Plays in honor mode and even installs mods that make the enemies stronger. Then he nearly rage-quits when he fights Grym, but he refuses to skip the fight. Surprisingly fond of Scratch and the owl bear cub.

Itachi- Rogue. Does multi-player with Kisame. Major completionist. He takes every choice very seriously and spends way too long deliberating over them.

Kakuzu- Warlock. He gets dragged into a multi-player run by Hidan, mainly to be his bodyguard as he starts fights with everyone. Gives Astarion up to the monster hunter and lets Auntie Ethel keep Mayrina. Greatly enjoys robbing Raphael. Hidan makes him keep Shovel as a familiar.

Hidan- Barbarian. You may be expecting him to play Dark Urge, but he refuses to associate with any god other than Jashin, so Bhaal is an imposter in his eyes. This doesn't stop him from still killing every npc he can get away with. For example, he kills the goblins harassing Barcus, then launches Barcus off of the windmill anyway. Regularly gets yelled at by Kakuzu for starting fights with massive groups of enemies.

Deidara- Wild magic sorcerer. Regularly gets the whole party killed with magic surges. Makes Karlach and Lae'zel carry a ridiculous amount of explosive barrels so he can use them in every fight. Blows up the Steel Foundry without saving the Gondians. He hates Gale for being ungrateful about his bomb, and he gets a game over in act 1 by killing Gale and refusing to resurrected him. But of course he save-scums everything so he never faces any consequences for his bad decisions :)

Sasori- Installs a mod to add the artificier class. He actually gets very into the story and enjoys the strategic elements. He claims he doesn't care about helping the side characters, but he's secretly nice to the tiefling children and that orphan in act 3.

Zetsu- Druid, of course. He's the one who plays dark urge, and the black and white half spend the whole game arguing about whether to resist or not. Licks the dead spider.