Odessa McWilliams

Odessa McWilliams was a woman Isabella met in Isabella and the Sign of the Moon. She has autism, but deeply cares for other people, regardless of what others might think. She is Vivian's long lost sister and a wonderful aunt to Isabella.

Appearances

 * Isabella and the Sign of the Moon

Personality
Regardless of being autistic, Odessa has a large personality, and deeply cares for the people around her. She loves all cartoons, and has a huge imagination. She loves to see what Phineas and Ferb build every day, much like Isabella does.

Isabella Garcia-Shapiro
Odessa really loves her niece, and often gives her good advice. She understands what Isabella means when she says she has a crush on Phineas, and often tries to "help" Isabella by showing Phineas how awesome Isabella is. Regardless, Odessa has a great friend in Isabella.

Phineas Flynn
Odessa realises that Isabella has a crush on Phineas and tries to "help" her impress him, to no extent. Phineas realises that Odessa has a problem, but he thinks she is cool anyways.

Ferb Fletcher
Ferb is quiet, so not much is known on his relationship with Odessa. Regardless, Odessa recognises that Ferb is Isabella's friend, and cares for him deeply.