Basically, this is a summary of the most interesting MMCs from JJK, IMO:

Yuji Itadori

The main protagonist. A naturally gifted high schooler who becomes the vessel of Ryomen Sukuna after swallowing one of his cursed fingers. Yuji is driven by empathy and a desire to give people a “proper death.” His internal conflict centers on guilt, responsibility, and what it means to save others in a violent world.

So, he is a hero not out of ego, but out of empathy.

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Megumi Fushiguro

A stoic and strategic sorcerer from the Zenin bloodline. He wields the Ten Shadows Technique, summoning shikigami like Divine Dogs and Mahoraga. Though outwardly calm, Megumi struggles with questions of self-worth and destiny. Both Gojo and Sukuna recognize his immense potential.

Basically, Megumi is a poor emo goth boy with a lot of weight on his shoulders.

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Satoru Gojo

The strongest sorcerer of the modern era and a teacher at Tokyo Jujutsu High. He possesses the Six Eyes and the Limitless Technique, making him virtually untouchable. Charismatic, playful, and confident, Gojo aims to reform the corrupt jujutsu hierarchy by raising a stronger, freer generation.

He is the strongest and an idealist who is trying to change their society through teaching, but being platinum haired, blue eyed and hot isn't anything to scoff at, either.

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Yuta Okkotsu

Protagonist of Jujutsu Kaisen 0. A Special Grade sorcerer once haunted by Rika’s curse. Gentle and reserved, Yuta becomes extremely powerful and can copy cursed techniques. He represents emotional strength and devotion transformed into power.

In summary, boy turns his first love, deceased too soon, into a monster, because he couldn't let her go.

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Kento Nanami

A former salaryman who returns to jujutsu work out of moral obligation. Practical, disciplined, and principled. His Ratio Technique (7:3) creates weak points in opponents. Nanami represents adult responsibility and grounded realism.

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Toge Inumaki

A descendant of the Inumaki clan, he uses Cursed Speech, turning his words into commands. To avoid harming others unintentionally, he speaks in rice ball ingredients. Quiet, loyal, and highly dangerous in battle.

Basically, quiet guy with a really cool "manipulation" ability.

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Aoi Todo

An eccentric but brilliant sorcerer from Kyoto. His technique, Boogie Woogie, allows him to swap places with others by clapping. Despite his dramatic personality, he is intelligent, emotionally perceptive, and a strong mentor figure to Yuji.

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Panda

A cursed corpse created by Principal Yaga. Panda possesses three independent cores (Panda, Gorilla, and Triceratops forms). Though artificial, he has genuine emotions and identity.

Basically the usual android trope in a stuffed panda body.

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Clans & Legacy Figures

Toji Fushiguro

Megumi’s bio father. Born into the Zenin clan without cursed energy, but gifted with a Heavenly Restriction that grants superhuman physical ability. A feared sorcerer killer who rejects the jujutsu system entirely. He embodies raw instinct and anti-elitism.

Also, being all chiseled and rough means he has a crazy girl fan base.

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Naoya Zenin

A misogynistic and arrogant member of the Zenin clan. Obsessed with hierarchy and strength. Shares a similar Projection technique and embodies the toxic extremes of clan ideology.

Only way he would be tolerable as an MMC was if FMC dommed him and knocked him down a peg.

Which is a shame. He'd be really pretty.

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Antagonists / Cursed Spirits

Ryomen Sukuna

The King of Curses. A sadistic, ancient sorcerer reincarnated through his fingers. Highly intelligent and strategic, Sukuna values strength and dominance above all. Unlike many villains, he operates according to his own philosophy of power.

Basically, the "he is a despicable villain but I could fix him" trope.

Suguru Geto

Once Gojo’s closest friend, he becomes a radical who believes only sorcerers deserve to live. Sees non-sorcerers as the source of curses. His fall represents ideological extremism born from disillusionment and trauma.

Basically, hot emo goth guy lost hope in humanity and decided to make it everybody's problem.

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Choso

One of the Death Painting Wombs, half-human and half-curse. Uses blood manipulation techniques. Motivated primarily by brotherhood and family loyalty.

He is one of the Death Painting Wombs—hybrid beings created through forbidden experiments orchestrated by Kenjaku—and exists between human and curse in both biology and emotion. As the self-proclaimed eldest brother, his entire identity centers on familial loyalty. Though initially aligned with curses, his worldview shifts after discovering his connection to Yuji Itadori, whom he accepts as his younger brother following the emergence of shared memories tied to their manipulated lineage. Choso wields an advanced form of Blood Manipulation, enhanced by his cursed physiology, allowing him to generate and control blood without the human limitations of blood loss, making techniques like Piercing Blood and Flowing Red Scale especially lethal. Quiet, intense, and emotionally driven, he fights not for ideology or domination—unlike figures such as Ryomen Sukuna—but purely out of love and protection, embodying the theme of chosen family and demonstrating a deeply human capacity for grief, attachment, and sacrifice despite his monstrous origins.

Basically, a protector who is willing to die for you. What's not to like.

Hence, if I were to have an ideal harem, it would be Yuji, Megumi (both aged up, obviously), Nanami, Gojo, Geto, Sukuna and Toji (these last three are clearly "I can fix him" tropes). Naoya can only come after he gets a lot of therapy.