Eureeka (performed by Cheryl Blaylock) is the title character and protagonist. Eureeka is a friendly sorceress-in-training. Her spells are not successful most of the time, but she keeps trying until she gets it right. Aside from her magic, she usually helps solve her friends' problems.
Vote which fictional character would naturally fit in-universe with a big-named franchise! No time-travel, no interdimensional crap, no "Pooh's Adventures", they would just exist in-universe.