Ferb Fletcher

Bartholomew "Ferb" Fletcher is among the main characters.

Trivia

 * He is usually quiet in the source material and only has at least one line in each episode.
 * According to a yet-to-be-revealed source, 'Ferb' is short for Ferbs.
 * The name Bartholomew is a reference to Perry's original name according to the movie Across the 2nd Dimension.
 * He, Phineas, 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.