>>715273771
>There is one
There is technically two.
Both Frisk and Chara are the player.
Frisk is the player who let's things go through the way they are "supposed" to, or how "Frisk would act".
Chara is player's dark urges. When you go and do genocide route, you let your dark urges take you over. And only thing you can do is accept what you have done.
Good things you do doesn't wipe away bad things you have done. That's why you get worst ending when you kill everyone before resetting and doing pacifist route. It is just facade of what you as player have really done, and you will let your dark urges go rampant.
Kris and [player] are different personas of course. While Undertale is about player restraining their freedom to let Frisk do what they want rather than let "Chara" side of them take control, Deltarune is about player using their freedom to affect Kris' choices who actively rebels back.
Kinda ironic when you think about it.