|Introduced in||"Gas-Powered Stick"|
|Latest appearance||"Arena See Through Zone"|
A pale-skinned sea creature with a mermaid tail that replaces their legs whilst swimming.
- Plum mentions the age requirement for a hover-car license is higher for Merewifs than it is for humans.
- Plum demonstrates that Merewifs can control water and take on a terrifying form while in water.
- When Merewifs are babies, they start out with tails and don't develop legs until they're older.
- Merewif's legs will get itchy when their legs are dry for to long.
- Merewifs (specially Plum) could be based on Merwitches, due to they look like mermaids and mermans, they make magic-like things (or at least Plum does them) and their names sound pretty much the same way.