Vinyl Cyn

Kai(lynx) was the middle brother xchara and frisk. Kai looked like a mix of xchara and frisk, when he was younger he would always stick around with xgaster more since he thinks that gaster doesn't do any harm and admires him . When xgaster were inspiration for his au from ink, kai was so amazed of the concept of the multi verse and timelines and wanted to explore it but he knows that xgaster won't allow it so he went back. Kai trusted xgaster with all his heart but once xgaster starts to overwriting timelines for being " not perfect enough " or "not up to standards". Kai grew resentment with his brothers to xgaster for overwriting timelines that are too precious to them.

Overtime due to accessive overwriting the timelines , Kai 's body changes like some sort of mutation or glitched like, his ears became wolf ears and grew a tail that seem to affect kai's physical and mental state. Kai tried to hide this from his brothers and xgaster but around one of the timelines, his brothers found out. They were shocked in a good way and hid it away from x gaster . Kai was grateful for their support. Then in timeline V(5) during the training session with xchara and xundyne that Kai accidentally revealed his wolf side to xundyne and xalphys but they had positive reactions about it. During the fight of xchara and Kai against x gaster. That's where Kai revealed his mutation to him. Xgaster's reaction isn't pleasant.

Xgaster banished Kai from their au and erasing every trace of Kai like memories and code from everyone except for xchara and xfrisk. Kai's brothers are naturally angry at xgaster for removing their sibling from their au . As Kai floats through a void and glitched out and changed their form entirely. Little to xgaster know, Kai still remembered everything and part of his code to xtale. Once Kai landed to the Omega timeline, core frisk found him and asked for his name. Kai responded with a fake name of "lynx kyden" and it stuck for a long time and never seen their au for a long time too. They don't know how long it is since their banishment and found ink.

Ink didn't know that lynx is Kai since their appearance is different from before. Naturally ink thinked that lynx is a new friend. Over time lynx developed her power that is linked to determination but it's completely different from they saw before it mostly relies on energy from lynx and they developed it further. Even though lynx hasn't had full control of their new power which is energy weaponry (which allows the user to make weapons using their energy stored in their own body)Now theyre now a guardian of the multi verse .

Art and xtale au by @jakei95

If y'all are wondering what Kai looks like, basically he's a mix xtale frisk and Chara

His appearance looks more like xfrisk and personality of xchara