(I don't own this picture. All Rights go to the owners.)

Name: Mad Brianna

Gender: Female

Age: Same age as Mad Ben

Appearance: Has long brown hair in a braid with orange hair streaks and wears a grey tank top, black ripped tights, a dark red skirt, orange and grey heeled boots, silver and orange ear cuffs, an orange and black vest, black and grey leather fingerless gloves, a navy-blue satchel and an orange crystal pendant.

Family: Mad Ben (Older Twin Brother)

Others: Second Wielder of the Omnitrix.

Sounds like Zendaya