Floyd

 is a monkey. His name was revealed in the character commentary for Attack of the 50 Foot Sister. He shows in the opening titles as the fifth thing that Phineas and Ferb do. He appears for the first time in an episode during Swiss Family Phineas when Phineas builds a tree house and Candace asks Phineas and Ferb why they are giving the monkey a shower.

Trivia

 * He worked with Doofenshmirtz on another project as revealed in the character commentary of Attack of the 50 Foot Sister.

Appearances
[[Category:F]]
 * "Swiss Family Phineas"(First appearance)