The Leader (brainy head)
Yup, the Leader already has a Minimate. But not one that shows off his current, brain-bursting-out-of-his-head look.
The Leader's "lumpy brain look" first appeared in the Hulk comic in the late 80's. The Leader was losing his gamma-induced intelligence. Desperate, he drained gamma radiation from a mutated Rick Jones and used it to recharge his body. The Leader regained his intelligence, and also gained his new cauliflower-head look.