All characters call the eponymous hero something different: Romany Wisdom calls him "Joey", Kenneth Crichton calls him "Joe", Lady J calls him "Joseph", MI5 Deputy Director Philip Gavin calls him "Agent Chapman", Grausum calls him "the man in the mask", Slaymaster calls him "Jackie Boy", Lancaster Sneed/Shockwave calls him "Jacko", Maximillian Zaran calls him "UJ", Vixen calls him "Jackson", Percy Hotchkins calls him "Junior Jack", and MI5 Director Annabel Warner calls him "the asset". Only Union Jack calls himself "Union Jack".