- Killer’s helmet has been noted to bear resemblance to the French musician Guy-Manuel de Homem-Christo’s helmet from Daft Punk. Daft Punk was made famous in Japan by their animated film Interstella 5555: The 5tory of the 5ecret 5tar 5ystem, during which time the duo were wearing outfits designed to make them look like robots.
- Killer and Zoro share a number of similarities, including their inclination towards killing/violence, status as the only non-captain Supernovas, lack of an apparent position in their crew, a fighting style that includes blades, and the only two who hold no apparent Devil Fruit abilities.
- After the timeskip, Killer’s bounty has been raised from 162,000,000 to 200,000,000.
- As stated in SBS, Killer eats with his mask on, and prefers food he can consume through the holes of his mask (stick-shaped or foods such as ramen). His meals have pasta as main every day and his favorite is Aglio e Olio. He also drinks alcohol through a straw. His stated preference for remaining masked while eating ascended from trivia to a known fact when he did just that in Chapter 793. In the picture below you can see Killer eating carrot and cucumber sticks.
- His favorite food is peperoncino, and his least favorite is curry udon.
- Oda said he picked the name “Killer” out of sheer laziness; thus the name holds little to no meaning. It means that he is the only Supernova introduced in the Sabaody Archipelago Arc whose name is not linked to a real life pirate or privateer and the only one of the group with no other meaning at all.
- Killers shares the same birthday with Vivi (February 2).
- In the 5th fan poll, Killer ranked 60th.