Top 3 Spider-Man Villains
I've included a lot of Spider-Man villains on previous lists. These are three that I haven't yet mentioned.
Prowler: Hobie Brown designed several inventions to use in a life of crime before reforming. These include a cape allowing him to glide and pneumatic boots that let him super jump.
Hypno-Hustler: Antoine Delsoin is one of the weirdest characters Marvel has ever come up with. And this is the company that created Armless Tiger Man. Hypno-Hustler's guitar allows him to play hypnotic music. He also has "hypno-boots" which release knockout gas. It would be hilarious if he somehow was added.
Mr. Negative: Martin Li was mutated by the same drug that created Cloak and Dagger. By day, he runs a soup kitchen, but by night he is an evil crime lord. Mr. Negative can control the Darkforce to either heal or corrupt things by touching them. This is what turned the Venom symbiote into Anti-Venom.
Top 3 Iron Man Villains
SHSO has surprisingly few Iron Man villains, especially compared to the number of Iron Men. These are a few of his foes that deserve to be playable.
Killer Shrike: In Iron Man: Armored Adventures, Killer Shrike was a Maggia enforcer. Despite the lame codename, Killer Shrike would be pretty fun to play as. His suit of armor grants him durability and flight, and comes equipped with power blasters.
Madame Masque: Madame Masque has taken several identities, including Whitney Frost, Whitney Stane, and Giuletta Nefaria. She's a Maggia assassin. In most universes, her mask just hides a scar on her face. However, on Earth-904913, it projects a hard-light hologram (sologram) around her, giving her the ability to look like anyone, similar to a shapeshifter. Madame Masque fights with intense energy weapons.
Count Nefaria: Luchino Nefaria is the head of the Maggia, a crime family. He was granted the powers of Atlas, Living Laser, and Whirlwind, but at a hundred times the magnitude. If he was added, he should be one of SHSO's most powerful villains.
Top 3 Fantastic Four Villains
The Fantastic Four have always been my favorite superhero team, but they've been neglected in the game recently. These characters would make up for it.
Diablo: Esteban de Ablo is a master alchemist who's been alive since the ninth century. He can use potions to shapeshift, freeze people, cause explosions, or transmute objects into other things. His Hero Up should be summoning four creatures, each one representing a different mystical "element": earth, air, water, and fire.
Wizard: In spite of his name, Bentley Wittman is a scientist, not a sorcerer. His greatest invention is anti-gravity disks, which, as you'd expect, negate gravity. He can use these disks to fly. Wizard is also the founder of the Frightful Four, a group completely absent from SHSO.
Dragon Man: Dragon Man, strangely enough, is neither a dragon nor a man. He's actually a robot. Dragon Man has strength, durability, flight, and fire breath. Dragon Man is another Frightful Four member.