Disney Wikia dá uma declaração sobre o que inspirou a criação do personagem Ducky Momo. De Momo Patinho
Ducky Momo was directly inspired by writer Jon Colton Barry's younger sister, Kristin, who looks very cartoony/anime-like. She has extremely giant eyes and big, pouty, lips that give her a "duckfaced" appearance. In gradeschool children would often tease her and call her "fish-face" and "duck-face". She was also the inspiration behind the character "Meap", which is one of her nicknames and an inside joke between her and Barry.
Isso não dá citações, mas o criador de Ducky Momo, Jon Colton Barry respondeu a um tweet que ele criou esse personagem. O tweet faz a mesma pergunta.
@mmonogram @joncoltonbarry I found an assertion that Ducky Momo from Phineas and Ferb is inspired from your younger sister Kristin. Is it true? Do you have a younger sister? If not, what was inspiration for the character?
It's true. My sister looks a bit like Drew Barrymore and I designed Ducky Momo as a caricature of her facial features. The "Momo" name was inspired by something my friend Alicia accidentally said, which was "momo." To this day, no one knows why she said this.
Jon Colton Barry uma vez novamente esclarecido no Twitter como resposta a Dan Povenmire:
Ducky Momo as a concept was not inspired by any specific other character/show, just sort of stylized Japanese animation in general. I designed his face as a caricature of my sister, who looks a bit like Drew Barrymore. His name came from something my friend Alicia said.
Assim, a inspiração deste personagem não é qualquer outro show, mas animação estilizada japonesa em geral, mas ele desenhou Ducky Momo com base nas caricaturas de sua irmã. Seu nome (Sim, Ducky Momo é um homem) veio da sugestão do amigo de Jon, Alicia.