Number 6/Relationships

Knuckleduster
Number 6 has great respect for Knuckleduster when he was the hero O'Clock, to the point that he has a huge poster of him in his apartment. When he was still an experiment he watched when O'Clock's career fell apart and lost his Quirk. His admiration is such that his characteristic scar on his face is self-inflicted, as a tribute to the one that Knuckleduster has. He is so proud of this scar that he can not bear to have another injury on his face.

Knuckleduster had no relations with him before investigating the Villain Factory. When Tanema tells Knuckleduster that the police have had an encounter with him, he recommends that, if the police come across the villain again, they'll shoot him down immediately. When they finally meet in person, Knuckleduster considers him nothing more than a villain, one that he plans to eliminate given that he is in possession of his stolen Quirk, so when Number 6 asks him to recognize him as his successor he flatly refuses.