"Who is everyone's senpai?"

Me: I'll let the others go first. (I have WAY too many senpais)

Papyrus: *looks in a mirror* ME.

Mettaton: papyrus!

Frisk: *shrugs*

Chara: Mcnuggets.

Toriel: nobody~

Asgore: *points at toriel* this woman is my destiny, she said;

Toriel: Ooooo~ Shut up!

Asgore: ;(

Monster kid: frisk.

Flowey: Chara.

Undyne: alphys.

Alphys: Undyne.

Sans: uhh... nobody?

Me: Sans. (And many MANY others)