The Boy who got Strong appears to have a light complexion, green hoodie, grey shirt, and tan jeans. After being distorted by the mirror, he becomes big and bulky, standing out amongst other of the children in the Little Nightmares universe.
Just like the other children who entered the house, he appears to have a childish curiosity without minding the risks and consequences.
As seen from his wish, he is arrogant and always tries to stand out as the strongest and best amongst other children, as well as trying to tease others.
He was one of the children who entered a derelict house with other two boys and the Humpback Girl. His desire as a strong person was to carry heavy things, build a real "sand" castle on the beach, and tease other children while sitting on the top of it.
After being distorted into a bulky-looking person, the Mirror Monster snatched him with his tentacle, bringing him into the mirror. The boy remains trapped within the mirror even after the Mirror Monster's supposed defeat.
Ever since then, his fate is left unknown.