Geekun has yellow skin, short brown hair, freckles, buck teeth, and round eyes with blue sclera and light blue irises. He wears glasses, a black and yellow striped bowtie, a white collared shirt, and blue pants with black suspenders. Geekun holds a maroon colored book in his left hand and his lower half is replaced by a Yopple computer.
Whoever is Inspirited by Geekun turns into an internet troll (someone misbehaves on the internet for amusement).
"Geekun" is the portmanteau of "geek" and the honorific "-kun".