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
In the 5th fan poll, Killer ranked 60th.
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.
Killers shares the same birthday with Vivi (February 2).
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.
His favorite food is peperoncino, and his least favorite is curry udon.
162,000,000 to 
