The Mom fiend was a fiend created by Vendetta as a substitute for Charlotte's mother. The Dad fiend filled in as a substitute for Charlotte's father. The fiends appeared in the episode "Parents". The Mom fiend was voiced by Fred Tatasciore.
The Mom fiend was supposed to destroy Charlotte, but was the first one to develop feelings for her; it saved Charlotte when the Dad fiend tried to eat her.
The Mom and Dad fiends were eaten by a whale.