Papyrus:

Works as a stable boy at the court of the family Dreammurs.

Wears Pancho with the Delta Rune.

It has no battle armor.

Sans's younger brother.

A good friend of Gaster's.

A former student of Undyne (he decided to drop out of training himself)

In this situation, he gave up his dream of becoming a Royal guardsman.

Still likes to cook spaghetti.

Not as hyperactive as in the orioinal universe.

I was friends with all the people.

Frisk's best friend ( Secretly in love with her).

Sans:

Apprentice to the Royal scholar Gaster.

Friend Alphys.

Papyrus ' older brother, takes care of him and loves Him.

Treated all people without trust.

At first, I was against communication between Papyrus and frisk.

Tries to joke, but fails.

The Delta Rune is sewn on his hood.

Undyne:

Head Of The Royal Guard.

Serves the Royal family well.

He is friends with Alphys and Sans, although he considers them "Nerds" and " Nerds"

Misses Papyrus, thinks It's a very good monster.

Her armor is not so bulky, it does not hinder movement.

Doesn't like people.

Believes that the Papyrus is gone from the guards just because of the Frisk, so treat her with disdain.

Guesses about Papyrus ' feelings for Frisk

Does not enter into a romantic relationship with anyone, as it considers it stupid and not necessary for the Royal guard.

Alphys:

A friend and colleague of Sans, shares his passion for science.

Gaster's Apprentice.

Good attitude to Papyrus.

Afraid of all people except Frisk.

He loves anime and tries to prove to others how interesting It is.

Taught Undyne to watch Anime.

The rune Delta is embroidered on the cuffs and pockets of her lab coat.

Created the body for Mettaton, and has earned the attention Asg

ore and Gaster.

In love with Mettaton, but is afraid to confess to him.

Has a good relationship with Napstablook often was asking him about his interests and Hobbies brother.

I know it's not much, but it's all there is so far.

Sorry for mistakes!