Let's begin with the MC: Indra Zenin
In a nutshell: wants happiness, happiness is eternal pleasure, so wants power, control, family, children, wives - basically the be the Conquerer of the whole world and then make the world a better place for people.
Appearance: Currently is 15, his height is 195 cm - will be taller in the future, rivaling True Form Sukuna in height.
(Image of Indra here)
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Kisara Zenin: A girl who was born with the Ten Shadows - the ten shadows can have multiple users in the same lifetime, since nothing besides the Six Eyes is stated to only exist once.
Her dad died when she was young, mother extremely ill, and they were poor. When her technique bloomed,
the elders and rest of the Zenin saw it as an insult that a girl was born with their most prized technique, so they were contemplating making her a broodmare for a heightened chance for the Ten Shadows to manifest in a son since she already had it.
She not wanting this, already understood that the most powerful person in the Zenin clan was Indra so went to him to make a deal, she would receive protection and marry him in the future - since having her would make his standing as heir more solid since he is a younger son of Naobito and not the oldest.
Indra refused - stating he doesn't need her to solidify his standing for his strength speaks for itself. Instead she will be his subordinate, and they will have a fake engagement, till in the future if he decides he wishes to break the engagement.
This deal was done in a binding vow which Kisara accepted.
(Kisara image here)
Kisara is currently 17 years old
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(Shiho image here)
Shiho Gojo: Satoru Gojo's older sister. She and Gojo have a complicated relationship.
Satoru was a loose cannon. He is far more talented in this AU than in canon since he is a Son of Heaven here - with Indra and Sukuna.
The Observer Heaven titles him - just as it titles Indra, the Sovereign, and Sukuna - The Cleaver of Worlds/The Destroyer.
He already had teleporting, flight, and a great mastery over infinity at the young age of 7.
He did whatever he wanted, damn the consequences, and destroyed thereby many alliances, such as the Higher Ups, other smaller clans, etc.
Since unlike in canon, they could make an alliance closer with the Zenin since they have Indra who is also a Son of Heaven.
Shiho tried to steer Satoru towards not doing so, but since as a girl, since young she was seen as unfit as heir, making her focus on politics, she didn't know how to do this, besides what she was used to - manipulation.
She loves Satoru, he is her little brother, but as she tried when Satoru was 7, he easily saw through it with the Six Eyes, and since then their relationship has been rocky.
In the end, she came to Indra for a political marriage, to unify the Gojo and Zenin clans, because of external threats from the international jujutsu world.
Shiho is currently 18 years old