Starlight isn't exactly sociable, but she's friendly. Wren is super shy and is a very awkward teen.

Anyways, since these characters aren't canon and the storyline is a bit strange I'm making it an AU called Unexpected Route.

Basically, player/Frisk fell in, did a pacifist run but didn't free the monsters.

So the monsters are s t u c k.

Meanwhile, human are conducting experiments to strengthen and give magical abilities to human souls, by fusing them with monster dust. This causes the child to have feature akin to the monster the dust came from. A few children like Starlight, Kitty, Cupid and Bella escaped and either ran to the mountain to escape or was taken in by Arial's creator.

And that creator wishes to inflict harm upon both human and monster kind.

Other characters like Anderella and Persephone are from nobility but were/are unhappy with their treatment.

Wren is a demon, so she's technically a monster. She has a demon soul, which is just an upside-down monster soul.

Any other questions about these characters can be answered, as I've basically planned a novel in my head lmao.