Ronan the Accuser (Lee Pace, Guardians of the Galaxy ... Rumlow is never a primary villain in the MCU, but he's about as good of a secondary villain as they come. From just being a corrupt SHIELD ...

In the MCU, the Kree never really make for compelling ... it’s amazing he was able to come off as evil as the Kree villain Ronan the Accuser in the first Guardians of the Galaxy.

Ronan the Accuser may be dead, but with a new version of the Silver Surfer joining the MCU soon and members of the Guardians of the Galaxy still floating around to boot, it’s more than possible ...

Uatu the Watcher first appearance in Fantastic Four #13 (Left) and Uatu in the MCU in What If...? (Right) Marvel Comics/Marvel Studios ...