Here some personality and other stuff he loves to make things and love to tinker with stuff.

Relationship

I'm also thinking of making Emblem and Carta brothers.

He doesn't fight you like his brother on pacifist.

A few words from him.

"So I see you met Sans he's part of the royal guard. Quite a big deal if have to say myself."

"Do you like star gazing human because here a telescope."

"So welcome to me and Papyrus little shack. "

-There appears to be tape and bones everywhere-

Yes some of his character is inspired by ts underswap papyrus.