This article is about Candace's future son. You may be looking for the inventor, Xavier Onassis.

Gender: Male
Age: About Phineas and Ferb's age
Nationality: American
Hometown: Danville
Friends and Family
Candace Flynn (mother)
Jeremy Johnson (father)
Amanda (sister) and Fred (brother)
Linda Flynn (grandmother)
Lawrence Fletcher (step-grandfather)
Jack Johnson (grandfather)
Mrs. Johnson (grandmother)
Phineas Flynn
Ferb Fletcher (step)
Isabella Garcia-Shapiro
Suzy Johnson
Reginald Fletcher (step)
Winifred Fletcher (step)
Clyde Flynn
Betty Jo Flynn
Hildegard Johnson
Tiana Webber
Bob Webber
Behind the Scenes
Debut Appearance:
  "Phineas and Ferb's Quantum Boogaloo"
Final Appearance:
  "Phineas and Ferb's Quantum Boogaloo"
Voiced by:
Noah Munck

"I'm sittin' under this digital tree!"
— Xavier[src]

Xavier Johnson is one of Candace Flynn and Jeremy Johnson's future children.


He and his brother Fred are generally inactive, and constantly like to make note on how they're just sitting in front of the digital tree in their family's backyard, much to the annoyance of their sister Amanda. Their life takes a turning point, though, when they by chance get a visit from the younger-aged versions of their uncles Phineas and Ferb. After the aforementioned visit, Xavier and Fred construct bumper cars that can move in five dimensions, but they still answer Amanda's query about their activities with "Nothing" ("Phineas and Ferb's Quantum Boogaloo").


Xavier and Fred are as bright and creative, and build impossible stuff just like Phineas and Ferb, although it took the younger version of their uncles to bring it out of them.

Physical Appearance

Xavier looks quite similar to Jeremy Johnson, having blond hair, bright blue eyes, and a similar face shape. He wears a white T-shirt with brown stripes and green shoulders, green pants, and red sneakers with white lining. It was later confirmed by Dan Povenmire that Jeremy and Candace end up staying together, thus confirming that Johnson is the father of Xavier.

Background Information

  • "Amanda" and "Xavier" are the two names that Candace had picked out for her future children. Given her interest in Jeremy, it's possible that he is the father of both children. This was later confirmed by Dan Povenmire during the 2015 San Diego ComicCon convention.
  • His, Fred's, and Amanda's situation is analogous to Phineas, Ferb's, and Candace's except rather than trying to "bust" her brothers for doing something, Amanda tries to bust Xavier and Fred for doing nothing. This being the case, Xavier is the Phineas of the pair as he talks more and he even tells that Fred that he likes Phineas while Fred responds that he likes Ferb.
  • In the Dutch version of Phineas and Ferb, Xavier is voiced by the winner of the Junior Eurovision Song Contest 2009, Ralf Mackenbach.
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