A girl who was raised by Sister in an England orphanage and fell in love with him. Picked up some of his habits as well.
Stella appeared one day during Sister's Mass near the Arakawa River. Despite her cute exterior, Stella is actually a cruel and violent girl on the inside. She can easily beat up any untrained opponents like Ric and when she's really mad, she will even transform into a form that looks like Kenshiro from Fist of the North Star.
With Sister's help, Ric managed to convince Stella to attend his school, but she still occasionally tries to extort him like a Yakuza boss.