YMMV / Fairly OddBaby

• Franchise Original Sin: For many, the introduction of Poof started the series' eventual descent into Seasonal Rot, as one of the problems the series have in the later years are adding new characters to spice up the show's formula. With Poof, however, many fans tend to tolerate him, and he proves to be rather divisive at worst, because the motivation for Cosmo and Wanda wanting to get a baby makes sense, and Poof doesn’t really divert much from the series' formula. But it wasn't until later on where they began to add more new major characters once per season, from divisive ones like Foop to hated ones like Sparky and Chloe, that fans began to complain about the show diverting away from the original intent. Add on older characters either being Demoted, or disappearing from the show entirely, and the push in the spotlight for said new characters, as well as Timmy‘s Dad and Mr. Crocker, and this led to more fans moving away from the show until its eventual downfall.