SN Chara

This is Chara from an AU / AT called Shattered Nexus

The premise is that it's an AU where the core blew up as Asriel came back from the surface and before Chara's soul is still there, and because the core wasn't finished yet, there was a massive energy discharge messing up the frequency of Chara's DT waves and given that Her ( and yes I made this one a Female, Fight me ) body wasn't there to support this imbalance Her Mind, Soul, and Consciousness was trapped within the void, where the only thing she could hear was herself, and all other senses were mute.

The reason Chara being gone due to this affects things such as it making sense that what remains of Chara's essence in our world ( the underground of the AT ) would be guiding you to escape, because of you're similar DT frequencies ( due to both literally having DT soul ) Chara feels that once the Barrier is destroyed It'd destroy wherever she is and she can pass on or exist as Chara feels she's trapped within the barrier, Only being able to release her consciousness and view those with the DT soul, and has to look through the perspective of the one she spectates.

Chara is latter found by Frisk after countless genocide runs when the door appears, and she also meets Gaster at this times, and Chara seems to be really attached to the Underground and Asriel not wanting to leave the underground even in a pacifist timeline.

After Frisk leaves for a while, Gaster and Chara run some tests on Chara's soul and realises that She cannot gain LV or XP, so when Frisk eventually comes back to either do a Pacifist or No Mercy run, Chara requests for all the LV he has before resetting the timeline once more, thus allowing Fisk to have no LV or XP and Chara being semi alive, but when the timeline resets she and Gaster are forced back into the void, but because frisk can no longer gain XP this forces frisk to do a pacifist timeline, but at the end when he breaks the barrier, the void feels as if something is changing due to all the power gained by Omega Flowey and all of the DT build up, and due to Frisk's and Flowey's DT Chara's soul frequency is strong enough to be picked up by the other souls, so when Flowey's plan fails, they release Chara by stabilising her DT using there own as a conduit / catalyst for her soul.

Her personality can be childish at times, and can be very determined / adamite and when she's exited about something causing her eyes to light up red (an example of this would be talking about something like chocolate) and she can be apathetic when away from Frisk for too long, as without his soul near hers she can't feel emotion properly, and she's also really caring ( In her own way XD ) and she dose what she thinks is right In her opinion, and can also be really lonely when not around anyone, and she can also be really clingy at times but she wouldn't admit it, also when she's not around Frisk or anyone else in that AU she can be extremely sadistic (she can be that way when alone for too long, not with anyone with DT, not around anyone with a similar frequency for too long, and when she's not in her own AU ).

Chara has Naturally Brown eyes, and light ginger hair ( Because I can ) and where's a horizontally striped black and red jumper, and she either where a black and red vertically striped skirt, or black shorts, and she wears black boots, when she's out of the AU for too long her Sclera can turn black, but when back will turn back to white, she has a weird allergic reaction to flowers which makes her blush without having the sneezing hay fever brings, and due to the souls she has a permanent body to store her soul, and due to the void being timeless she hadn't age since she had died, yet still has the experience of the timelines, when she feels really comfortable with someone she wears a red tulip in her hair