Sans is a researcher and assistant scientist with Alphys and the humans to create advanced technology. When sans is not working there he is a stand up comedian and runs a hot dog stand
Frisk is and teacher at Toriel's school and is very sweet
Sans brother Papyrus is part of the royal gaurd with undyne who transfered into local authorities
Sans left eye glows blue
Sans dad Dr W.D Gaster fell into his creation being shattered across time and space 
Sans mom (Arial) was killed by a human with a gun