Diamondback
If you’re wondering why there are so many entries in this list from Marvel’s various TV series, that’s because the MCU has a bad habit of killing off its villains instead of, well, saving them for movies like Thunderbolts. Both Crossbones and Batroc the Leaper were members of the team in the comics, but both are dead in the MCU. Yellowjacket could have given the team its equivalent of Ant-Man, but he got squished. So bringing back Erik LaRay Harvey as Luke Cage’s evil half-brother Willis Stryker is by no means a bad idea as long as they give him the super-suit that grants him strength and durability.
