Hate Plague: He uses nanobots to unleash one on the Avengers.
Insufferable Genius: MODOK has an ego even bigger than Tony Stark, no mean feat there, and little impulse control. He also bitter about the fact that the Skull is in charge and views MODOK as little more than a technical adviser and supply officer.
Kick the Dog: He uses the Adaptoid to knock some fighter planes out of the sky. His next course of action? Take aim at the helpless pilots who ejected themselves in the nick of time.
Appears to have finally gotten some respect from the others during The Final Showdown, after his quick thinking and intellect helped engineer Cosmic Skull's defeat. The others don't object (at least for now) when he takes leadership of the Cabal.
Pet the Dog: When the alliance between the Cabal and the Avengers has successfully defeated the Cosmic Skull, MODOK's first act as new leader is to leave well enough alone and fight another day.
Pragmatic Villainy: When things get bad in The Final Showdown, he's the first to seriously consider allying with the Avengers, even saving them from certain death.
The King of the Vampire Nation, Dracula is centuries, if not thousands of years old. He fought with Capatain America against HYDRA and the Skull during World War II when they invaded his kingdom. But that alliance was only temporary, now he seeks Cap's blood as he believes it will make him immune to sunlight.
Deadpan Snarker: Gets in a good one on both MODOK and Attuma at dinnertime.
(after witnessing Attuma's lack of table manners) Dracula: The repugnant one does have a point. They're called "utensils", try one!
Enemy Mine: With Captain America by the past, and later with Skull. And with the rest of the Cabal, pulls this with the Avengers against Cosmic Skull.
Evil Cannot Comprehend Good: He's quite confused when Captain America pushes him out of the way of a Cosmic Unibeam, mostly because he's spent a good deal of the season trying to suck his blood and turn him into an inhuman thrall.
Evil Counterpart: To Thor since he is the supernatural powerhouse of the Cabal. When there is a battle Thor and Dracula usually face off.
Knight of Cerebus: Well, he did blow up his home planet when the people didn't submit to his rule and has no problems with attacking children, which is pretty dark, to say the least.
Knight Templar: Thinks he's a hero combating the forces of evil. But if you oppose him or even disagree with his methods, he views you as part of the problem.
Might Makes Right: He's stronger than everyone else, and he expects them to line up and obey him.
Mythology Gag: His antagonism towards Thor and his rescue from SHIELD by the Cabal darkly mirrors his friendship with the God of Thunder and liberation from the clutches of AIM in Jonathan Hickman's Avengers run.
OOC Is Serious Business: When Hyperion is calling someone a "villain" that villain being Red Skull, who was just revealed to be trying to wipe out his entire army for the hell of it, you know it's gotten bad.
Pragmatic Villainy: He makes a perfectly logical point when he pressures Skull to kill the Avengers, as they are "beaten, not broken."
Rage Quit: So the people of his home planet rejected him and rose up against his totalitarian rule. His response? Blow up his homeworld and start looking for a new planet where he could establish himself as the top dog.
Badass in Distress: During The Ambassador, when he's forced to go without weapons for the duration of the episode when speaking to the United Nations.
Big Bad Ensemble: He's the most recurring major villain outside the Cabal and is actively working against Skull.'
Day of the Jackboot: We get a good look at what New York City would be like if Doom had ruled it for a few years in Planet Doom.
Demoted to Dragon: Doom actively averts this, vehemently refusing to follow Skull's lead.
In Exodus, we learn that this was a very smart choice indeed.
Diplomatic Impunity: Doom's a super-villain but he is also the legitimate head of state of a sovereign nation, which grants him some legal protection. The Avengers trying to find a way around this forms a considerable plot point in Ambassador.
Don't You Dare Pity Me!: His reaction to Tony offering to assist in rebuilding the Destroyer destroyed area of Latveria, is to shock him, refuse, and tell the Avengers to get the hell off his land.
Egopolis: He renames Earth Planet Von Doom after he conquers it and changes the Statue of Liberty to a statue of himself when he makes New York the capitol of his world empire.
Emperor Scientist: Granted, he plays around with magic just as much as he plays around with technology.
Enemy Mine: The Avengers, especially Cap, end up escorting and body-guarding him during his visit to the United Nations. Of course, Doom has ulterior motives.
Even Evil Has Standards: For all that that he's an evil, power-hungry bastard, Doom is genuinely horrified when he sees the damage that he did to Latveria while wielding The Destroyer. Black Widow even notes this as the first sign that something isn't right with him: As much of a tyrant as he was, Doom never stooped to killing his own people.
Evil Is Not a Toy: Invoked when he tries to summon and control the Midgard Serpent. Whether he would succeed in controlling him or not is left ambiguous at best. Later, it's shown that he did succeed in controlling the beast. However, he still went overboard with the Destroyer.
Out-Gambitted: By Captain America and the Avengers in "The Ambassador".
Pet the Dog: He genuinely cares about his country even if he's a dictator. He also went out of his way to save Cap, something that shocked the Cabal and the Avengers into silence for a while. Even if he had ulterior motives, he seems to have at least a hint of sincerity when doing this.
Shout-Out: Going with the show's heavily movie-inspired approach, this Loki is an almost complete copy of the MCU version. His first appearance is giving the same Kubrick Stare he gave in the movie, and he's in the same pose as well.
Smug Snake: While he's competent, he still looks down on the Avengers despite past events and is prone making the same mistakes.
CEO of Hammer Industries, a major weapons manufacturer and a self-declared rival of Tony Stark. Tony, meanwhile, describes him as an obnoxious loser wannabe.
Big Bad Wannabe: Wanted to join the Cabal. Unfortunately, his attempted audition didn't impress Red Skull. His robot, on the other hand, did. He tries again in Savage and comes close, again, to joining the Cabal before getting overconfident and getting his ass handed to him.
Villain Has a Point: He verbally rips Hawkeye a new one by pointing out that he and the Hulk fight over every stupid little thing, causing massive collateral damage in the process, and that he just put what they do naturally every day on live television but somehow he is considered a bad guy. You can tell by Hawkeye's facial reaction that he realize Mojo does have a valid point.
Son of the supervillian Molecule Man, Aaron Reece has recently acquired his father's invention: a device that allows the user to manipluate non-organic matter on the molecular level. He doesn't want to follow in his dad's footsteps and for most of his debut episode just wants to be left alone. Tony eventually convinces him to join SHIELD and talks Nick Fury into taking him in.
Cursed with Awesome: The wand only works for him and his dad, and while it's powerful, it's also wrecked his family, sent his dad to prison and put him in AIM, and by extension HYDRA and Red Skull's, crosshairs.
Cut Lex Luthor a Check: Reece Sr. invented what Tony Stark rightly called "the invention of the century" and the only thing he could think of using it for was to go on a crime spree.
The Allfather of the Nine Realms, and the king of Asgard. One of the most powerful beings in the universe, he is also a fair leader to boot. Though he holds no malice towards Midgardians, he believes they are weak and insignificant in the grand scheme of things. He wishes Thor would choose Asgard over Earth.