Let's Voice UnderTale! (playthrough with voice acting!)
codemonkeylikefritos for Monster Kid
This kid is Undyne's biggest fan. When they're not gushing over how cool Undyne is, they're stalking Undyne. This voice can be fairly freeform.
*bursts out of the bushes as Undyne is about to ambush the player*
Undyne!!! I'll help you fight!!!
*does a double take at Undyne and the player*
Yo! You did it! Undyne is RIGHT in front of you! You've got front row seats to her fight!
*does another double take*
...
Wait. Who's she fighting???
*Undyne grabs Monster Kid by the cheek and drags him off screen*
Hey! You're not gonna tell my parents about this, are you?
I hope I don't get points off for ad-libbing the "ow ow ow ow". In my defense the little kid is being dragged off by Undine by his ear... or, um... ear-analogue.
I don't take points off for ad-libbing. I think it's great when people really try to get into their roles by doing that.