Undyne: fell into the underground to prove a point (that anime was real)

Rain kid: their favorite book to read with their best friend was the adventures of fluffy bunny.

Pappardelle: likes to say nyoh a lot.

Muffet: has a great singing voice. Was the queen but was never married to the king the two were just kid hood friends.

Gaster: makes way to much dad jokes his son hates a lot of them.