Wilhelmina is one of Gimli's teachers, she's the homeroom teacher, and she teaches literature, chemistry, and math.
Wilhelmina is a small, old, granny-like fairy with teal-grayish eyes and gray hair. She wears black circle-framed glasses and an orange wizard-like hat with yellow trims, and a yellow robe with an orange cloak. Wilhelmina's wings are yellow with white tips and they're slightly transparent. She wears simple orange boots.
Wilhelmina is nice, kind, and instructive.