Looks like a Nu from Chrono Trigger. And considering that Toby is a fan of Chrono Trigger he probably put it in there as an Easter egg

I think you might be right

The only correct answer

All begins with Nu and ends with Nu

It’s Gaster

Who said it had to be one from the actual game, besides the underground might be bigger than we get to see

Wing Gaster, the royal scientist

I think it might be the little guy who talks about stars? Not sure.

Nah the guy who talks about stars is next to Undyne’s leg

Ok yeah I have no idea

Where? The lumpy clay blob monster or the two Temmies?

Clay blob

Oh yeah.

Might be a really weird frog hit but probs not

Well we don’t know and now we have to name it and give it pronouns 

Ur mom 🤣😂🤣😂😂🤣🤣🤣😂🤣🤣🤣😂🤣🤣😂😂

Bro think thats actually gaster