Sebastian Roy

“I’d heard so much about this new recruit being a monster that I half expected him to turn into a living corpse like the goddess Hel, or a miniature version of the sea serpent Jormungand. Instead, the animal grew into a regular human teen, long and lanky, with a swirl of dyed green hair, black at the roots, like a plug of weeds pulled out of a lawn.”
― Rick Riordan, Magnus Chase and the Hammer of Thor