Peter Parker / Spider-Man
High school student, S.H.I.E.L.D. agent, and Reserve Avenger, Peter Parker, a.k.a Spider-Man, is one of the Hulk's best friends.
- Animal-Themed Superbeing: Spider, as usual.
- Ascended Extra: He has a much larger role in Avengers Disassembled.
- Breaking the Fourth Wall: In the same manner as he does in Ultimate Spider-Man, where he explains certain situations and elements as well as what goes on in his mind in relation to that situation.
- Bunny-Ears Lawyer: He narrates his adventures and is prone to daydreaming and goofing off in the heat of battle. Despite this, he's a highly skilled super hero and Iron Man's first choice to replace Captain America. He's also quick to notice and identify the problems with Cap and Iron Man's plans.
- The Bus Came Back: After a long absence for four years, he returns in Season 5.
- Butt-Monkey: His introduction in the show is working as a street vendor to pay for the thousand or so hot dogs the Hulk ate and left Spidey with the bill for.
- Chuck Cunningham Syndrome: Despite his Reserve Avenger status, he does not appear at all in the third season. This is particularly notable since the four-part adaptation of Civil War brings back almost every other superhero that the Avengers had encountered in the past 3 seasons, and Spidey still doesn't show up. Taken even further when, in Season 4's Halloween Episode, Hawkeye uses Web Arrows and sarcastically asks a Hydra scientist where he got the idea from, without Spider-Man's actual name being dropped. It appears that, with Spider-Man having his own new show in a separate continuity, Drake Bell's Spider-Man will not appear on-screen anymore.
- Looking to be averted with him appearing in Guardians of the Galaxy's next season, but this was then revealed to be the new, different version of the character.
- Continuity Snarl: His whole character ends up as this. In episodes taking place while Ultimate Spider-Man was on the air, he seemed like the version from that show, complete with that version's voice actor. However, when that series was replaced with the Marvel's Spider-Man reboot, Spidey's Avengers appearances now seem like it's the Spidey from that show, complete with that series' voice actor. The two Spider-Man series are completely incompatible, with very different origins for some of the same characters, so it's not clear how the Avengers can meet both.
- Determinator: Spider-Man was the only hero not trapped and who still held out when The Squadron Supreme took over Earth and presumed the Avengers dead.
- Flanderization: In Avengers Disassembled, most of the Ultimate Spider-Man traits (the chibi sketches, Spidey's narration telling us things we should be able to tell through the action and characterization, the wide eyed monkey-screech) are on ramping up, ironically at the same time when these traits have been toned down in its own series.
- Guns Akimbo: Wields a pair of high tech pistols in Planet Doom.
- Hero of Another Story: Specifically for Ultimate Spider-Man.
- Honorary True Companion: Just like Ant-Man, he's a reserve member of the Avengers whom Iron Man can call in if necessary. He's not officially a member, but he's treated as one nonetheless.
- Super-Deformed: His Chibified self from his Imagine Spots taken from Ultimate Spider-Man are used in his second official appearance.
- This Looks Like a Job for Aquaman: Spidey is the only other hero whom Adaptiod can't adapt to.
- What the Hell, Hero?: Gives this to both Iron Man and Captain America for the way they've been acting. Spidey calls out Iron Man for being a terrible leader, and Captain America for quitting the team and going against everything he taught him.
- Whole Costume Reference: He wears an outfit based off his Noir incarnation in "Planet Doom".
The galaxy defending crew of badass mercenaries. The Avengers run into them when Galactus is warped to a far-away planet for consumption.
- Badass Crew: Obviously.
- Bash Brothers: Groot becomes this with Hulk.
- Early-Bird Cameo: Star-Lord makes an early appearance in Mojo World watching Mojo's bloodsport on TV with Impossible Man.
- Early Installment Weirdness: When they return in Season 2, their appearances have been dramatically altered to resemble the depictions of the characters seen in the movie, and how they appear in their series, as well as any subsequent appearance they make in the other Marvel Animated series. Their personalities have also undergone overhauls, as now they bicker as they did in the film, and they're much more light-hearted as opposed to their all-business nature they had in Season 1. Rocket's also picked up his film incarnation's "humie" moniker.
- Fantastic Racism: Rocket makes no secret of his contempt for humans and humanity in general.
- Flat Character: Surprisingly, all of them, despite being the centerpiece of an entire episode. Especially Drax and Gamora.
- Hero of Another Story: They are the guardians of another galaxy, after all.
- The Lancer: Rocket to Star-Lord.
- Remember the New Guy?: Thor already knew who they were, but we find out how he met them in their self-titled series.
- Wolverine Publicity: Their roster and appearance was clearly meant to advertise the then-upcoming film.
The Sorcerer Supreme himself.
- Early-Bird Cameo: Like the Guardians of the Galaxy and Ant Man before him, he makes his debut in the series quite some time before his MCU film was released.
- Guest-Star Party Member: To the Avengers during the Infinity Stone crisis, and also during the Season 3 finale.
- It Has Only Just Begun: If the Guardians of the Galaxy's presence on Earth wasn't proof enough, Strange makes it very clear that the recent activity regarding the Infinity Stones has brought the universe's eyes to Earth.
- No-Sell: He's immune to the corrupting nature of the Infinity Stones.
- Refuge in Audacity: He fights enemies like Dormammu on a regular basis, and where does he shack up? A normal New York apartment.Clint: In New York, nothing's normal.
- Super Doc: The Battleworld arc reminds us that no, he has not forgotten his original profession. He is shown treating injured patients the old-fashioned way, because circumstances rendered using his magic risky.
A race of superpowered beings who reside in the floating city of Attilan.
- Adaptational Heroism: Black Bolt, at least regarding the show's version of Inhumanity. In the comics, Black Bolt was completely aware that there were human/Inhuman hybrids all around the world, and purposefully unleashed the Terrigen Mist on the world in order to transform them, without any care about the consequences. In the show, it's implied that most of the Inhumans were unaware of the hybrids before meeting Inferno, and it's actually the Avengers who end up releasing the Mist as a last ditch effort to thwart Ultron.
- Awesomeness by Analysis: Karnak can see the weakness in anything, and then attack it.
- Badass Normal: Karnak is the only member of the team without any powers, and he does just fine without them.
- Fantastic Caste System: The Alpha Primitives are a slow-witted slave race that serve the other Inhumans.
- Fantastic Racism: They initially view ordinary humans with distrust and contempt. A large part of their character arc involves them coming to trust humans and build a bridge between the two species.
- Floating Continent: Attilan, though it later is brought down to Earth by Ultron.
- Happily Married: Black Bolt and Medusa. When the members of the royal family are kidnapped by Ultron, it is implied that Black Bolt is most concerned for Medusa.
- Make Me Wanna Shout: Black Bolt's strongest ability is his highly destructive voice, which is why he rarely speaks.
- Royals Who Actually Do Something: The members of the royal family are all skilled combatants and have no problem fighting their own battles.
- Prehensile Hair: Medusa's primary power.
- Smug Super: They are very arrogant and view themselves as being above normal humans.
- Suddenly Voiced: Crystal has her first speaking role in season 5.
- The Voiceless: Triton appears, but has no lines. Crystal initially didn't, but then spoke in season 5.
A teenager from upstate New York who was discovered to have secret Inhuman heritage.
Thaddeus "Thunderbolt" Ross / Red Hulk
A violent former military officer with powers similar to those of the Hulk.
- Adaptational Modesty: His comic counterpart wears nothing more than a pair of Magic Pants. While in the show, he has a shirt and combat boots, just as he was portrayed in Hulk And The Agents Of Smash.
- Aesop Amnesia: It's clear he's back to his old mentality, having forgotten about his lessons on teamwork from Hulk And The Agents Of Smash. It's quite justified, as it's been a while since he last fought with the SMASHers.
- Ascended Extra: Went from a non-speaking cameo in a single episode of Season 2 to actually joining the Avengers for an arc in Season 3.
- Chuck Cunningham Syndrome: Despite his role in the latter half of Season 3, he is not one of the Avengers called upon by Vision and Black Panther to join the team in Season 4. An alternate future version of Red Hulk does appear in a later episode as part of the timeline where Kang conquered New York.
- Early-Bird Cameo: He previously appeared in a Season 2 episode as one of the Squadron Supreme's prisoners, and his picture appeared in Season 1 when he was trying to call Hulk.
- Suspiciously Similar Substitute: In-universe, he was chosen to join the Avengers because he was the next best thing to the actual Hulk.
An Olympian god who seeks to join the Avengers.
- Big Eater: When he believes he's been accepted into the team (despite nobody actually telling him this), he orders a truly ludicrous amount of pizza to celebrate.
- The Big Guy: Even discussed in-universe. While Black Panther is vocally against Hercules joining the team, the other Avengers point out that he'd make a nice replacement for Thor.
- Boisterous Bruiser: As per any portrayal of the character, he is extremely powerful, as well as extremely loud and full of himself.
- Foil: He is essentially Thor without any of the responsibility or restraint.
- The Friend Nobody Likes: The other Avengers (especially Black Panther) quickly come to find his behavior obnoxious.
- I Shall Return: He ultimately decides against joining the Avengers, but promises that he will return to take his place on the team once he has become responsible enough to deserve it.
- Super Strength: He is incredibly powerful, with the other Avengers speculating that he is on par with Thor and the Hulk.