This page lists the numerous characters that appear in the Marvel Gems Universe.
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Ultimate Alliance
See here.S.H.I.E.L.D
Nick Fury
The eyepatch-wearing director of S.H.I.E.L.D who helped to assemble the Avengers and has been keeping an eye on the Crystal Gems for a while.
- Big Good: Serves as this for Secret Wars.
Maria Hill
Second in command to Nick Fury within S.H.I.E.L.D.
Phil Coulson
A leading figure of S.H.I.E.L.D who assisted Nick Fury in bringing together the heroes that would soon become the Avengers. He's a fan of Captain America in particular.
Villains
Titus
An ex-member of the Nova Corps and ally to the Chitauri who comes across the Human Zoo in his search for the Guardians, where he allies with Holly Blue Agate.
- Starter Villain: The first Big Bad faced in the Marvel Gems Universe.
- Villain Team-Up: Allies with Holly Blue Agate to capture the Guardians and the Gems.
Holly Blue Agate
The strict overseer of the human zoo working under Blue Diamond.
- Villain Team-Up: Allies with Titus to capture the Guardians and the Gems.
Loki
A Frost Giant who is the Arch-Enemy of his adopted brother Thor.
- Cain and Abel: As always, he's Cain and Thor's Abel.
- Starter Villain: The first villain that the Crystal Gems team up with the Avengers against.
MODOK
Also known as the Mechanical Organism Designed Only for Killing. MODOK is the leader of A.I.M and frequent adversary of the Avengers who arrives in Beach City to research Gemkind.
- Butt-Monkey: Throughout his time as Big Bad of "The New Crystal Gems: Rise of MODOK", his appearance is made fun of by Peridot & Lapis and frequently loses his temper.
- Determinator: MODOK himself claims that giving up is like dying for him.
- Evil Genius: He isn't the Scientist Supreme for nothing!
- Jerkass: Claims that Peridot is pretty much useless to the Gems which puts her in a little crisis.
Mephisto
The Marvel equivalent to Satan who becomes an ally of Thanos during Secret Wars, but was actually playing the long game.
- The Dragon: Much like in The Infinity Gauntlet, he serves as one of these to Thanos.
- Disc-One Final Boss: Is the final villain faced in Part One before Thanos.
Thanos
A fearsome Galactic Conqueror who has targeted the Infinity Stones time and time again for the sake of wiping out half the universe to win the affections of Death.
- Berserk Button: Weakness. He insults the Crystal Gems for becoming so much weaker since he last faced them in the rebellion, calls out Peridot & Lapis for being useless and allows the Black Order to die for failing him at the beginning of the Secret Wars.
- Big Bad: Of Secret Wars.
- Composite Character: His goals are a mix of his Stalker with a Crush on Death with his Well-Intentioned Extremist motives from Avengers: Infinity War.
- Deal with the Devil: His relationship with Death is given a dash of this.
- Evil Counterpart: Proclaims himself to be this to Steven, as both are powerful hybrid beings but Steven is a Nice Guy while Thanos is an Omnicidal Maniac.
- If I Can't Have You…: When Lady Death rejects him, Thanos just decides to Leave No Survivors.
- Purple Is Powerful: Famous for his purple skin.
- Red Eyes, Take Warning: Depicted with these.
- The Social Darwinist: His despising of weakness makes him pass off as this.
- Villain Respect: As he is turned to stone at the end of Secret Wars, Thanos commends Steven for sticking to his pacifism and decides to Face Death with Dignity.
- We Can Rule Together: Offers this to Steven when he gains control of the Infinity Gauntlet. Of course, Steven rejects the offer.
The Black Order
Corvus Glaive, Proxima Midnight, Ebony Maw, Black Dwarf and Supergiant. These five monsters form a group of Thanos's most feared minions in the galaxy known far and wide for the skills they use to serve their master. Corvus is pretty much immortal if his glaive isn't broken, Proxima's spear never misses what she throws at, Dwarf's strength rivals Hulk, the Maw is a silver-tongued telekinetic and Supergiant is an Ax-Crazy Gravity Master.
- Ain't Too Proud to Beg: During the destruction of Battleworld, the Order ask the heroes if they could come along on the Milano back to Earth.
- Cruel and Unusual Death: The ways they're all killed in Part 2 are pretty gruesome. They all get better.
- Black Dwarf has his heart punched out and stomped on by Jasper.
- Ebony Maw gets his neck snapped, again by Jasper.
- Supergiant is grinded into her blood against a rock.
- Corvus Glaive is disintegrated by Thanos using three of the Infinity Stones, leaving behind only his glaive.
- And finally, Proxima, distraught by her husband's death, takes the glaive and stabs herself with it.
The Masters of Evil
A Legion of Doom made up of various cosmic Marvel villains who have struck a deal with Thanos in exchange for their own wishes being granted. They consist of the Red King, a Symbiote, Hala the Accuser, Fin Fang Foom, Titus, Veranke & Super-Skrull, and a Brainwashed and Crazy Silver Surfer.
- Deal with the Devil: Most of them allied with Thanos for the sake of revenge.
- Legion of Doom: Made up of various space-themed Marvel villains, and Silver Surfer before he defects.
Truman Marsh
The apparently deceased secretary of defense who perished in a car accident before somehow returning to life. Despite his affable nature, there may be more to him than meets the eye.
- Composite Character: Seems to be assembling a version of the Thunderbolts, similar to Norman Osborn.
- Foreshadowing: Despite claims that he allegedly survived that accident, there are clues pointing to him potentially being Ultron in disguise.
- Reports of My Death Were Greatly Exaggerated: Even says it word for word when he debuts.
Erik Lehnsherr/Magneto
A mutant Holocaust survivor & Arch-Enemy of the X-Men with the ability to manipulate metal and a very complicated relationship with his old friend Charles Xavier.
- Dark and Troubled Past: Rose Quartz tried to rescue him from Auschwitz during World War II, but she was distracted by a HYDRA attack and subsequently poofed. Erik took this as an act of betrayal and battled her when they met again in the 60s.
- Villain Team-Up: Allies with Doctor Doom to capture Steven so Doom can study him.
- Well-Intentioned Extremist: He wants to help mutants much like Xavier, but he has far more violent means of doing so.
The Brotherhood of Mutants
Magneto's group of followers who fight for mutant supremacy much like him. They consist of Mystique, Juggernaut, Toad, Blob, Black Tom Cassidy, Pyro, Avalanche, Sabretooth and Lady Deathstrike.
Victor von Doom/Doctor Doom
Ruler of Latveria and Arch-Enemy of the Fantastic Four, but he has a particular hatred for Reed Richards.
- Everyone Went to School Together: Unlike in the comics where he went to college with Reed & Ben, all the Fantastic Four attended the same university as him.
- For Science!: So far, his goal in relation to Steven.
- Later revealed in Chapter 5 that he wants to study Steven's Half-Human Hybrid nature and use his genetics to either create Super Soldiers or become part-Gem himself.
- Missing Mom: The accident that forced Victor to cover his face was an attempt to see his mother in the afterlife gone wrong. He tries offering the same to Reed in his flashback.
- Mythology Gag: After scarring himself, Victor vanished before reemerging as a billionaire named Victor Domashev who funded the spaceflight where the Fantastic Four would gain their powers, similar to the two major live action Fantastic Four films.
- Say My Name: The flashback to Doom's college life with the younger Fantastic Four ends with him shrieking "RIIIIIIIIICHAAAAAAAARDS!" as his portal machine self destructs.
- Villain Team-Up: He wants to study Steven's hybrid nature, so he recruits Magneto to capture him.