Marvella

Marvella is Mavis' twin sister and a minor character in the Hero's Guide series.

The Hero's Guide to Saving Your Kingdom
It is mentioned that Mavis and Marvella are famous in their kingdom for painting each other's toes- not toenails, but toes. She is also mentioned as being present at Duncan's wedding.

Trivia

 * She and her sister Mavis are known to dance to imaginary music, literally paint each other's toes, walk their pet crickets on leashes and constantly sniff each other's hair.