Kazuya Amon has dirty blonde slicked-back hair with long sideburns. He has a tall and muscular build. In Yakuza 2, he has a full medium length beard, and in Yakuza Kiwami 2, he has a small moustache, though in other entries, he lacks facial hair.
Kazuya wears a black button down shirt, carcoat style overcoat, black slacks, black leather oxfords, and black lensed silver frame aviator sunglasses.
Little is known about Sango's personality. He mocks Kiryu for asking who hired him, as hitmen don't usually disclose who hired them to their targets. He appears to take great pride in the reputation of the Amon clan.
Kazuya Amon is an apprentice of Jo Amon and the oldest of the Amon brothers.
Yakuza 2/Yakuza Kiwami 2
Kazuya Amon appears in the final substory of Yakuza 4 to challenge Shun Akiyama.
Kazuya Amon appears once again in the final substory of Yakuza 5 to challenge Shun Akiyama.
Kazuya is adept at utilizing weapons and unarmed combat, as he is able to effectively dual wield two battle axes.
Kazuya dual wields battle axes in combat. In Yakuza 2, he uses them as if they were kali sticks, can perform evasive rolls, and use a sweep kick when getting up from the ground. In Yakuza Kiwami 2, he utilizes a kali stick moveset with his axes, and he eventually gains a red colored transparent shield after losing enough health that blocks heat actions but eventually disappears after some time. He enters heat mode after losing enough health, glowing with a red aura and dealing more damage.
Kazuya utilizes a peek-a-boo boxing stance, moving around the arena and circling around Akiyama quickly and almost constantly. His attacks include a left hook, a left low roundhouse kick, a right low roundhouse kick, a right uppercut, a double spinning right backfist, a double jab into a right hook or a low right kick. and an ax kick. His right roundhouse may combo into a high left hook kick, and he may only use the jabs in his jab combo and not bother with the hook. He quicksteps around and bobs and weaves frequently, turning his attacks into combos by quickstepping and then using a quick attack and repeating. When knocked down, he can catch himself to land on his feet. He can use a right hook that has the potential to launch opponents with a small wind up. After he loses enough health that some of his orange health bar is depleted, he will enter heat mode and glow with a yellow aura, He can use all of his previous attacks, though he gains new ones, including a quick left hook and a quick right hook. He can also combo a left hook into a jumping right uppercut. He will dodge and bob and weave much more frequently in heat mode.
Kazuya uses Akiyama's moveset in combination with Shinada's slide tackle and a command grab reverse judo scissor takedown. He can close the distance between himself and his opponent by running extremely fast and low to the ground.
- The Amon brothers' first names have a number theme. Kazuya, being the oldest, has the kanji "一" (one) in his name.