Nick Fury (he counts? That's like saying Franklin Richards is a member of the Fantastic Four),
Considering that Fury carried his own title for years and is one of the most highly-trained normal people out there, the comparison isn't fit; he's certainly not a 'sidekick' type and the Ultimate Universe version of him is possibly even more capable than the 616 version. More than likely he'll be in the command role but he's still a capable operative.