Dum-E, Butterfingers, and U

Dum-E, Butterfingers, and U are three sentient robotic arms/robots created by Tony Stark. Dum-E was created in 1996, Butterfingers in 1997, and U in 1997/1998. In black and gold, they are seen helping Tony with testing out his suits, and he admits that views them in a similar way to his own children.