Which lesser seen character dserves a cartoon?
i think the character should have a solid run of stories to draw from. And almost more importantly a good animation crew.
I think Iron Fist would be a great new animation. I would choose either Batman's (Matsudas) camp or JLU's camp.
I would say Cage would be equally interesting but with the lack of "minority experts" in th biz I wouldn't want to be offended when Cage starts talking.