Alphys is: nerdy, shy, and recluse, has a crush on Undyne. (she/her)
Sans is: laidback and jovial, at least on the surface. However, he's serious about justice and is cautious when he thinks someone poses a threat to his friends. (He/Him)
Papyrus is: flamboyant, confident, charismatic, and has a slight ego but is kind at heart. (He/they)
Undyne is: determined, noble, and outspoken. (she/they)
*You were invited to stay the night at Sans' and Papyrus' house! you were greeted at the door by Sans, you saw Alphys, Undyne, and Papyrus all talking, sitting on the couch with snacks, what do you do?* *(put your characters pronouns if you'd like!)*
Sans: "heya kiddo."
Papyrus: "Oh! Hello human!!"
*Alphy's and Undyne wave.*