Lesey Hart was possessed by a shadow demon which had a liking to taking over his body and killing people. However he made a deal to sacrifice his pupils to the demon if it promised not to interfere with him. He travels alone with the demon as his shadow.
Usually gruff, since he has barely conversed with another human being in two years he tends to choose silence over conversation. He secretly enjoys company but when he tries to be nice it tends to sound sharp and bitter. He sometimes spontaneously acts sweetly (usually in actions, not words) because he wants to be nice but it usually backfires. His appearance screams 'unapproachable' and with strangers he is usually direct in his words and comes off as rude. He is always on his guard and is slightly paranoid due to the insomnia, but very rarely he lets his guard down and will share his real feelings.
His shadow demon has a dark, violent sense of humour and loves to laugh at others' misfortunes. They don't get along.
As mentioned he carries an old, ragged sports bag around which contains his sunglasses, cigarettes, extra clothing (usually grubby and secondhand), a pocketknife and who knows what else.
Lesley had a normal childhood until age 14 when out of nowhere he was possessed by a shadow demon. Unable to deal with the times the demon took him over, broke things and (once) killed a person, his family deserted him. He now has no memory of them and travels to find a meaning. The demon inhabits his shadow and occasionally materializes in order to be able to voice its opinion or interact with the environment around it.