Ukon

Ukon was the one who attached himself to Kiba, literally. I've never seen the episodes with the Sound Ninjas, so I don't know all the details, but Ukon is Sakon's twin brother and lives as a second head on his brother, though he sometimes gets a body of his own, or jumps onto someone elses . . . . Something like that . . . (And he didn't get his own card in the CCG, Sakon got a card, Karasu the puppet got a card, that scum Baki got a card, but Ukon didn't get a card . . . ) :

Ukon, Sakon, Kiba, Sound Ninjas, Naruto, Karasu and Baki are copyright Masashi Kishimoto-Sensei.

P.S. Sakon is the one with the necklace, not Ukon, but I didn't know Ukon didn't have a necklace when I drew this. It is Ukon, he just borrowed his brother's necklace for the picture