Lord Salamander, as leader of the Space Pirate guild, is responsible for a great deal of the atrocities they regularly commit across the galaxy, while also hosting violent underground blood sports. Desiring to rule over the galaxy, Salamander turns a peaceful religion into a fanatic death cult, while having 12,000 planets launch statues of their goddess into orbit, unaware that they are rigged weapons that will bombard the worlds until they submit to Salamander's rule. Murdering his followers to avoid sharing power, Salamander is barely stopped by Cobra and spitefully attempts to destroy Earth to deny Cobra satisfaction at his victory. His true identity makes things worse, as Salamander is a psychic project for the crippled body of Adolf Hitler, hungering for conquest after 3000 years.
Space Adventure Cobra: The Movie: Crystal Bowie/Crystal Boy of the Space Pirate Guild, Cobra's Arch-Enemy, is a massive being made of crystal who desires the power of the world of Myrus. Brainwashing one of the three princesses of Myrus, Catherine, into loving him, Crystal Bowie has her murder her own sister Jane and later hunts down the third sister Dominique, killing her comrades before killing her as well. Using Catherine to unlock Myrus, Crystal Bowie reveals he plans to use its powers to blow up the entire Seventh Galaxy, killing all there as a warning to the rest of the galaxy to never defy the Pirate Guild.
The show doesn't care much about scientific accuracy, as it is more Space Fantasy than hard SF. Going by the Mohs Scale of Science Fiction Hardness, it's soft enough to pour it in a cup and drink it.
After that he's in a fight with the Guild pirate Sandra, who's using a powerful lightning gun against him. How does Cobra defend himself? He rips out a bunch of iron bars and hurls them directly into the lightning bolts, because IRON ABSORBS ELECTRICITY! Sorry Cobra, it doesn't...
French love Space Adventure Cobra and for good reasons — it was one of the only anime who was not victim of Gag Dub during the '80s.
Very popular in Sweden too.
He's Just Hiding: Rock Knight in the Sega CD game gets this a lot. Many fans have declared Fanon Discontinuity on his death. This includes the boys at Retsupurae, who shouted cries of "NOT CANON" instantly after the death scene in question.
A game based on the Royal sisters storyline was released for the Sega CD, and is generally regarded by those who've played it to be pretty bad, with Cobra as a Designated Hero through most of it and every other decision tree having But Thou Must! pouring out of it. It was the subject of a seven hour MST by Retsupurae.
Inverted if you're talking about the more recent lightgun game, based on the same storyline, although Your Mileage May Vary since its gameplay is damn-near identical to Time Crisis.