Fiends are creatures made prominently by Vendetta. She makes them through a process similar to baking, and mixing together ingredients to form them. Vendetta seems to be the only one in Clamburg who knows how to make fiends, although in one episode Charlotte was able to make a friendly fiend (suggesting it is Vendetta's wickedness and cruelty that makes them evil) without help from Vendetta. (Vendetta only gave her the ingredients.)
Vendetta gets her fiend recipes from a large green cookbook. The base ingredient is a colorless powder, or liquid, called Fiend Mix. Vendetta has been shown in episodes such as "Puppies! Puppies! Puppies!" to be able to make simple fiends from only Fiend Mix, and more complicated ingredients are needed to make fiends with more potential. Another interesting point is that adding any ingredient that doesn't fit can make the fiend come out entirely wrong, as shown in the promo clip "Ralph" and in the segment "Parentnapped".
The crushing fiend that destroys anyone that it hears singing in "No Singing" was made with the following ingredients: Grape punch, three crunchy spiders, and a piece of toast. It came to life in the microwave, which could mean that some fiends are brought to life by being heated. The ingredients of the pigeon fiends are unknown, but they had to be in the oven before they hatched. Smash was also made of ingredients seen by viewers. These include a jarful of purple liquid (and the jar), a drop of fiend mix, a toy cymbal playing monkey, and a picture of Charlotte so he will only attack her and not backfire on Vendetta (which happened anyway).
There are many fiends that take prominent roles in the show (see characters), but many fiends are only shown in one or two episodes before disappearing forever. Many fiends were taken from the online series, such as in the episode "Marvin the Middle Manager"; the "library fiends" were previously "noise-making fiends" shown in web episode 16, "Rainy Day Schedule".
Charlotte can manipulate fiends very easily. It has been shown in many episodes that giving fiends sugar of any kind, or sometimes even just showing them affection, can make them turn benevolent. It is unknown whether this is a flaw present in all fiends, a mistake Vendetta repeats by accident, or some unspoken power of Charlotte's.
Most fiends Vendetta creates only have one purpose, and seem only capable of doing one thing. It is unknown if it is just because a lack of intelligence, if Vendetta only surrounds them with one thing to do, or if it is in the ingredients. Grudge, however, is a more complicated fiend who does anything Vendetta asks.
List of fiends
- Main article: List of fiends