Bella is a one time character in Clarence. She was the mystery girl in the the episode of the same name.
Bella appears to have brown skin, a soft, black curly medium-height hair, wears glasses, and wears a magenta sweater and dandelion pants. She has a torso similar to Gilben's.
She is a bit shy at first, and a bit quirky like Clarence but watered down to a more mature point, despite of having things in common.