Chara is the vessel theory
I have a undertale/deltarune theory
How we know, Kris has personality like frisk, like we know they had own backstory, their own desires and are not us
Then there is chara...
I think chara is our vessel, like in deltarune, but vessel doesn't mean us, it's our creation:
Has our name, changes depends on ending and our actions, gaster says that we created a wonderful "creation", we know nothing about chara, chara is shown in the beginning tricking us to believe we will play as them but in reality we play for a completely different person, like how it was in deltarune with the vessel
Also if we look, kris has charas desing, so that's means that chara will have Frisk's design. So we see that the vessel has two stripes like frisk, sooooo we can assume that in this universe frisk aka the vessels is our creation and chara aka kris is a person that we possessed.
Then i did a drawing for my theory of my OC-fied chara, A.k.a what if Toby fox put customization in undertale
What do you think?