Phineas Flynn

Phineas Flynn is among the main characters.

Trivia

 * He, Ferb, and Isabella were originally going to appear in their 1#-year-old forms, but in mid-to-late January 2021, it was decided that they would appear in their 18-year-old forms from the episode "Act Your Age".
 * On 3x7=21, it was decided to not make Phineas and Ferb stepbrothers in this series.