Ferbella is the non-canon pairing between Ferb Fletcher and Isabella Garcia-Shapiro.
- In 'Phineas and Ferb's Quantum Boogaloo', it is mentioned that Isabella may marry Phineas.
- In 'The Beak', Ferb is irritated when Phineas gets all of Isabella's attention and praise for being a superhero.
- In 'Phineas and Ferb: Summer Belongs to You!', Ferb listened while Isabella talked about Phineas not noticing her, and offered her a handkerchief when she started crying.
- In the episode 'When Worlds Collide', Isabella accidentally took Ferb's hand.