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This is Arial. 

She was an artificially made monster made with the intent to be either be used as a spy or a weapon, as she can replicate some of the monsters' powers. She seems to have some kind of trauma linked to any kind of scientist mentioned, so she's a bit hesitant towards characters like Gaster or Alphys

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This is Minne. She's a redeveloped Undertale OC. She is basically a physical manifestation of any and all timelines. She's manifested as a child and is basically in the void due to there being nowhere else to be put. She hasn't grasped the concepts of morality or awareness, due to having no influences other than timelines. I've centred her design around more neutral colours but have also added in a colour similar to the one of the original design in order to pay some respect and recognition to whom she started off as. Her soul is 'Memory'

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These two are linked to both Arial's and Kitty's <--(will be shown later) backstories. They work for the 'creator' after running away with many others for being lab rats. The humans have been dabbling with the monster dust they'd found during the war. They've taken orphans to be experimented on, infusing their souls with monster dust. They regain some kind of ability or feature from the monster dust they've received.  The infusing is painful for quite a bit because the children's' souls must experience the pain their monster counterpart experienced. Bella Donna is a poison maker and is partnered up with Cupid, who was able to gain archery skills from his cupid-like monster. They make a dangerous combo and are hesitant to leave the side of someone who's shelter them, although it is painful at times. Cupid has determination and Bella Donna has Justice.

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What I didn't mention before was that the artificial monsters are made using the DNA of pre-existing monsters and an artificial infusion of magic enhancers. Arial was made from both Sans and Papyrus, technically meaning she is somewhat a relative. Penelope-Anne is taken from the DNA of Asgore and (mostly) Toriel. She's been infused with artificial magic boosters, which make the fires extremely hot and powerful. She's sweet, much like Toriel, but it takes quite a while to calm her down if she's angry. She is also an artificial creation by Arial's creator.

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Anderella is a hermaphrodite, meaning that he has both male and female genitals/parts. He is of royal status, but somewhere in his story he's taken/kidnapped by the 'Creator'. I plan to have him have great importance in my AU. It's not obvious what his soul is, since, in my AU, royalty have a certain type of soul. It could be an advanced version of the normal/main soul or something else entirely.

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Persephone is the sister to Anderella. She's the counterpart to Anderella (will explain soon) and runs away to Mt Ebott to presumably commit suicide. She fails because the flowers somehow cushion her fall. She sprains her ankle though (though that's a bit irrelevant). As said, all royalty hide their souls.

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Kitty is one of the orphaned children experimented on who escaped. She was chased up Mt Ebbot, where she jumped down to escape. Presumably, the dust was that of some kind of cat monsters. She was unscathed because her body didn't really absorb the shock from when she landed. She is taken in by Toriel and is very wary of anybody else other than Goat Mum herself,. As shown by the picture, her soul is bravery. She's extremely flexible and can fit in small spaces.

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The hanging tree is a character that pops up only in a certain route or choice. She is a spirit of a tree that used to be aboveground where humans would hang themselves. The oak tree spirit eventually adapted some of the features before being moved underground. It's unclear on what's coming from her eyes but it's assumed to be some kind of symbol of when a body is rotting and the blood turns black.