Chelsea

is a student in class 502 and a classmate to Nathan and Katie.

Physical traits
Chelsea has short brown-red hair and unique looking eyes with extra-large irises. She wears orange overall shorts with a yellow shirt and black, knee-length pants underneath, and has green shoes.

Yo-kai Watch
Chelsea can be seen hanging by the art exhibit in the museum, and asks the player if they're interested in museums as well.

Yo-Kai Watch 2
Chelsea can be found in the lobby of the Excellent Tower, where she admits the tower is her favorite thing and thus hangs out there all the time.