Denis

Dennis is an old friend of Simon Brezhnev and the owner of Russia Sushi. He works inside Russia Sushi as the chef, while Simon usually stands outside attracting customers.

Characteristics
Dennis is a large white man usually seen working behind the counter as a chef for Russia Sushi. As such, he is always seen wearing the Russia Sushi uniform. As a result of his past in the Soviet Union, like Simon, he is a pacifist, and tries to stop conflict before they start.

Although his strength is unknown, he is shown to have significant skill with knives, with both skills acquired as a sushi chef and possibly from battle. When Masaomi Kida and Kyohei Kadota were discussing the Yellow Scarves vs. Dollars war, as tensions rose Dennis threw his knife into the scroll on the wall, narrowly missing his customers (but slicing off a bit of Togusa's hair) and freaking them out. As it is unlikely he actually tried to kill any of them, this indicates that he has very good aim.

Anime
Anime specific spoilers about this character per episode.

Episode 01:

Episode 02:

Manga
Manga specific spoilers about this character per volume/chapter.

Volume 01:

Light Novels
Light Novel specific spoilers about this character per volume/chapter.

Volume 01: