You know, Everybody thinks Frisk as Connor but I think Chara as Connor and Sans as Hank would work out.



We dont know if they can actually get along. At first, Sans would hate Chara when Chara is the actual Connor at the start, Just a robot, Emotionless, Only there to accomplish their mission.



Frisk fits Kara better, A kind motherly figure.



Undyne would actually fit Markus.



Asgore as Luther would also work, A though guy with a actually Golden Hearth.



Toriel as Jerry would also work, Because just like Jerry, Toriel wants to see childeren and make them happy.



Alphys as North kinda works I guess...



And as for the major role..''The Player'', Amanda will fit them well, More than Chara. To us, Chara is actually our puppet, Just like how Connor is like a puppet to Amanda.