Jackson

He is the great grandson of Dr. Henry Jekyll. He is part human and part fire elemental, as his father is one. Due to his mother's Jekyll/Hyde lineage, he has a monstrous brother named of Holt Hyde. Jackson longed to be a monster until he discovered his brother was a monster whom he now wars with. Believing himself to be fully human most of his life, he has grown up among monsters in a world where the two groups mutually dislike each other, causing him to be cautious and shy but not easily intimidated just because someone's a monster. As well as careful and kind, Jackson is a dedicated scientist and one of the best students at Monster High. Jackson's brother is Holt Hyde, known as D.J. Hyde

Jackson is a friendly guy who enjoys playing casketball, though he has a geeky fashion sense and is sometimes picked on by other students. He appears to be the only human student at Monster High, making him confused by his apparent normalcy in a school full of monsters.

In the diaries, he once asked Draculaura to bite him, Draculaura's 'Basic' diary, August 29 as he was afraid they couldn't really be friends when school started. Draculaura was able to talk him out of it, but she could tell he was still depressed.

In the Monster High book series, he is not afraid or uncomfortable about being around monsters and interacts with them quite easily. Draculaura noted in her diary that he was unfazed when he met her father, who normally creeps out both humans and monsters.

In the cartoon, he seems much more wary around monsters, most likely due to being bullied at school for being a "normie." He even went as far as to say that he "didn't belong," and that no one would want him at Cleo's party in the webisode "Hyde and Shriek."

Because of his shy personality, his body language is nervous, and he tends to hunch his shoulders.

Jackson has dark brown/black hair with blond tipped bangs, blue eyes and a pierced left eyebrow. He has a yin and yang symbol between his shoulders however if it was, then Holt would probably likely have the tattoo as well. He wears black framed glasses with a button up yellow shirt which he had half untucked and a green, black and grey checkerboard sweater vest with black trim. He wears a blue bow-tie, blue and green high-top sneakers, grey pants, and a black belt with a silver buckle.