Thoughts on Undertale Characters (Chapter 5 spoilers)

So I beat Chapter 5 earlier today and tbh while I liked it, it made me realize how out of place all of the Undertale characters feel. Toriel, Undyne, and Asgore show up in a Dark World, yet neither of them do anything of note to the point that their inclusion feels unnecessary. It honestly makes me question what the point of including them is if they aren’t going to do anything. If they were replaced with completely new characters nothing would change as the parallels to their Undertale counterparts come off as very surface level for the most part. Maybe this is just wishful thinking and a mix of that odd feeling that comes from forming your thoughts after experiencing something for the first time, but I just wish more was done with them that properly builds off of the fact that this is the second time we’re seeing a version of these characters.