X-Less' Hero Costume consisted of a blue bodysuit with a light upper half and a darker bottom half. His sleeves are decorated by a dark blue section with three yellow stripes, and larger dark blue stripe wraps around his head and over his right eye. He also wears a red cape.
Sometime before the Paranormal Liberation Raid, he adds a pale lens over his right eye, presumably designed to aid his Quirk.
X-Less is a cautious individual as he opted to destroy an unknown machine inside the villain's lair before carrying on with his mission.
During the Paranormal Liberation Raid, X-Less is one of the Heroes who assaulted Jaku General Hospital, coming into conflict with several High-End Nomu. Alongside Present Mic, however, he managed to get to the room where Tomura Shigaraki was being operated on, finding him in a death-like state after Present Mic interrupted the procedure. Present Mic tasks X-Less with disposing of Tomura while he takes care of Kyudai Garaki. Before doing so, X-Less notices an unknown machine and decides to destroy it.
However, before X-Less can destroy the machine, Tomura Shigaraki recovers from his near-death state and awakens. X-Less is stunned as Tomura proclaims his discomfort, stating that he is cold. Shigaraki then kills him, taking the deceased hero's cape for himself.