X-Tale Oc I'm currently working on, since I'm hyped on that series ^^
Idk how to introduce a character, but she goes with the name XR, yup only XR, a creation of X-Gaster yet called as "The First X-Event experiment".
She became the X-Event already right before Frisk and Chara were ,and also, her code has been deviated from the one X-Gaster had obtained to create her in the first place which made her an anomaly later on- that happens to be having her not being set in a timeline, she is a different kind of creation that X-Gaster might use in the future for his plan to work.
She was created differently,and more likely she is created as an experiment for X-Gaster to test out if his soul might cause him to create a stronger yet balanced creation with property.
During her creation, she was actually first made from a sample of the HATE Vial that Ink Sans had kept to(that's for my side for sure,though it's not canon lol) and gave it to X-Gaster to keep since it won't be furthermore be hidden until the HATE comes out, so X Gaster had planned to establish some experimental probability of his soul and HATE, what might cause, except the idea that the planned creation won't be as rage full as the HATE would cause to be, and also, there were some taken out from Frisk and Chara's DNA, so that X-Gaster would create the same vessel, the same extraction.
Due to that, it caused an Overwrite just for the experiment to be produced well, despite of the Hate quietly operating inside it's Vessel.
After a newly made experiment, there she is, the First experiment for the X-Event, in which X Gaster could fully use in the future. When she first existed, she still acted as untamable as the HATE inside would operate,but then due to X-Gaster's soul being more stronger than it, it would behave well working inside the vessel's body, more as tamed on a limited time.
She's named as XR,an acronym for "X-Event Rage" that she disgusted herself(though I cannot think of any other name for her lol due to her lore XDD),and would serve as X-Gaster's assistant alongside Alphys, yet then she discovers her part on how Ink keeps her to his side as to watch the effect, XR seems to be as normal as the two human children, XR-on the other hand , after confirming her entity with X-Gaster, she discovered that she also had the power to Create and Destroy, and also, an uncanny soul was blessed to her, a mysterious one(Magenta Soul on the picture) that seems to rival X-Gaster's soul than what it is.
Her entry has been unknown, timeline also undefined, later on she's secretly working for rebellion, as what Frisk and Chara longed on the early times before their turn in the X-Event. She purposefully did it in a deal, knowing that she might as well risk her own existence for the sake of it. Yet then, X-Gaster would later find out, causing her to deny everything ,running away from him would be a great plan for her to stop him from figuring it all out.
She's currently known as ENTITY, due to the X-Event , Frisk and Chara are now merged, and how X-Gaster longs to destroy her at will, knowing that he can't because she's already has her own entity through the different soul she has , yet the HATE + X-Gaster's soul works with her all too well.
Due to the base that he can't destroy her, he planned to trap him in a void instead, and make sure she wouldn't come out to be seen nor reminded again. X-Gaster didn't take out his soul out of her as a sign of Grace, but he made sure he wouldn't seek her again when the X-Event does the plan.Overall, she's brutal. She caused havoc in X-Gaster's plan, though she might be killed but that wouldn't be a good idea for him either, or else the timelines that he created will be shattered completely due to its impact. Generally, her neutral state caused her not to be seen ever again, after all the chaos and catastrophic inventions she used to intervene.
She's currently called "The Forbidden Experiment", which would later appear on the arc that Ink Sans is searching for Cross, he's the only one who could ever remember her.
(P.S:There is a lot about her that lack explaination ,that's all I can say for now )
(and also X-Gaster decided to define the creation's gender a girl so he would make sure it wouldn't be like the two boys who are getting upset,yet he didn't expect she'd go worse than them XDDD)
X-Tale by @jakei95
UnderTale by @tobyfox
XR by me^^