I honestly imagine The Empire being humans and the Rebels being monsters...It would be the only time I would cheer for rebels because I actually always hope the rebels and jedi get killed and the Empire and Dark Side wins.



But in this case, I would support monsters who would be the rebels.



I honestly think Chara as Darth Vader and Gaster or somebody who is supposed to represent the Player would go well as Emperor.



Asriel as Obi-Wan would also work because of the ''You were like a brother to me Anakin, I loved you!'' line can be changed to ''You were like a sibling to me Chara! I loved you!'' and that would fit quite well in my opinion.



Sans as Yoda would also go nice because just like Yoda, Sans is a complete troll and he is small in size, but he is pretty damn powerful just like Yoda.



As for Han and Leia, Even though maybe it wouldn't fit too well, Asgore and Toriel..Or maybe Undyne and Alphys would fit better..You can decide that.



Frisk as Luke? HELL YEA.



Boba Fett should be..Er..Idk...Mettaton NEO maybe?



You decide the rest, Either way this is a great crossover.