7 Souls Undertale

You play as everyone except Chara and other living monsters, that is, only for souls and Frisk.

Chara has Asriel (the prince of monsters, dead, reincarnated as a flower and named himself Flowey), Frisk (partners, once made a deal that no one knows about)
Justice has Flowey (former friend), Chara (thinks they're friends, but Chara hates him), Marlette (missing), Starlo (missing/deceased), Courage (they're like brothers), Frisk (Justice is proud of them)
Goodness has Mettaton (a ghost who inhabited a robot's body, lives on the surface and runs his own show), Alphys (who helped along the way, lives on the surface and is living a happy life), and Gammy (who disappeared and became an amalgam).
Perseverance has Gerson (a store clerk, lives on the surface) and Toriel (a goat mother, lives on the surface).
Honesty - V.D. Gaster (saved her, introduced her to his sons), Patience (found a common language)
Courage has Justice (like brothers), Jelly Monster (best friend, the only one from the royal guard who protected him, but then he was fired and died of old age)
Patience has Honesty (they found common ground), Froggy (a cute little frog who thinks he's a cat and lives on the surface)
Frisk has all the souls and Chara (I don't think I need to explain), Flowey/Asriel (they saved him and became friends), Undyne (he's afraid of her, but it seems normal), Papyrus and Sans (the skeleton brothers, cool), Asgore (the king, he likes to drink tea made from golden flowers with him), Toriel (a caring goat mom), Alphys and Mettaton (they helped a lot)

Souls cannot know their own names. For example, Justice's name is Clover, but he doesn't remember his name, can't hear it, and can't read it. If you write a name on a board, the soul won't be able to read it; if you speak it, it'll just be white noise. However, other souls can recognize the name of one of the souls. Again, for example, Justice doesn't know his name, but Courage does. And at the same time, Courage doesn't know his name, but Justice does. They address each other as Justice, Kindness, and so on.
This doesn't apply to Chara and Frisk. Frisk is still alive, and Chara, unlike souls, is just a proto-ghost who lost his soul.
No one except Frisk can see all the silhouettes of souls and Chara, especially after the pacifist
Their deaths: the very first was Chara, poisoned by flowers (on purpose), and then her soul was absorbed by a monster, who then died. Then Patience died on a spiked puzzle. Then Courage, from the royal guard. Then Honesty, in a waterfall, from falling rocks. Then Perseverance, who died falling from a great height. Then Kindness, who reached the King of the Underground and gave up her soul. Then Justice, whose death resembled kindness: he managed to befriend the monsters and loved them so much that he decided to give up his soul to help (though Justice hates the rabbit). Frisk didn't die; they were able to befriend everyone and free the monsters. Now the monsters live on the surface, but Frisk sometimes goes underground to communicate with everyone.
There was also one monster left in the dungeon—Flowey the flower. They used to be friends with Justice, but it turns out the flower was evil. It later turned out to be a dead prince who was reborn as a flower. And the prince was Chara's best friend and half-brother. Chara blamed herself for killing him with her desire for revenge on humans, but Flowey couldn't see her, and Chara couldn't bring herself to apologize.

A non-binary child who is still alive, uses they/them pronouns, is 6 years old. Yellow skin, brown hair in a bob, eyes always closed, blue sweater with pink stripes, brown shorts and boots.

The boy who died at 15 (the oldest) represents justice. The silhouette of a boy in a cowboy hat and with a toy revolver looks like a cowboy.

A girl who died at age 12 represents kindness. She wears a cooking apron and a frying pan (she doesn't always carry it with her), and her hair is as shaggy as a fir tree.

A boy who died at 13 represents perseverance. A purple silhouette of a boy with a book (not always) and glasses.

A girl who died at age 10 represents honesty. A blue silhouette of a girl in ballet flats and a tutu, her hair tied in a bun.

A boy who died at age 8 represents courage. An orange silhouette with short curly hair, a bandama, and boxing gloves.

A girl who died at age 10 represents patience. A blue silhouette of a girl in a dress, with a toy knife, a bow, and long hair in a ponytail. On her chest is a blue soul, distinct from the rest of the silhouette.