Source: youtube.com
2. Crimson Dynamo
Man, Iron Man goes through Crimson Dynamos fast. There have been so many.
Anton Vanko invented the armor and fought Iron Man until Tony tricked him into defecting to the US of A. He worked for Stark until a new dude, Boris Turgenov, stole the armor to become the second Crimson Dynamo. Vanko fought back, and they both died.
Alex Nevsky was Crimson Dynamo III, Vanko’s former assistant. He was upset at Vanko’s defection, so he built a new suit and fought Iron Man, but he eventually fled and was killed by the KGB, who took the suit. They gave it to Yuri Petrovitch, who failed in his first mission, so they took it away and gave it to Dimitri Burkharin.
He was also a KGB agent for a long while, but that ended when the Soviet Union fell. He eventually turned into a good guy, in fact. He even helped Tony Stark escape Norman Osborn by lending him his armor. Sweet guy. There have been other Crimson Dynamos (13 in all), but it’s Dimitri who’s become the defining one, and the one who is most often seen in the armor.

