Ichiban Kasuga (春日 一番, Kasuga Ichiban) is the main protagonist of the Yakuza series from Yakuza: Like a Dragon onward, as well as the main protagonist of The Legend of Ichiban Kasuga: Part 1 in Ryu ga Gotoku Online.
Described as having been born with "nothing but physical strength," Kasuga has a balanced muscular build that gives him the opportunity to be proficient at a variety of fighting styles.
The dragonfish tattoo on his back earned him the nickname "The Rock-Bottom Dragon" (どん底の龍, Donzoko no Ryū
A member of popular Japanese band "Arashi", "Nino", as he is often called by fans, is not only a talented singer and dancer, but a versatile actor as well, best known perhaps for his role as "Saigo" in Letters From Iwo Jima.
Ninomiya Kazunari has been said to "act with his eyes", a talent that can be seen in Yasashii Jikan (Gentle Time) and Letters From Iwo Jima (Iwo Jima kara no Tegami).
Karuna is a great friend who may have many problems, but in the end is always, always. there for you. Karunas are sometimes lazy, but they are still loyal and will try to do whatever they can to make you feel better.