Kazuya's ability is Rage. It boosts his damage output and will boost his grab by a ton. It will become actibe when at 100% once each stock. It will disappear after getting a grab of, by missing too many grabs, or by letting a certain amount of time past.
His neutral B is a laser that pierces and can hit multiple opponents. It can be tilted downward, upward, and be used in the air.
Kazuya's side B is a quick punch. It has a sweet spot and a sour spot. When hitting the sweet spot it stuns the opponent and can be comboed into a smash attack. If hit by the sour spot they are launched into the air. When used in mid air you cannot use an up B afterwards.
His up B is a glid upward dealing damage all the way up and being a decent kill move.
The down B of Kazuya is a command grab move that slams the opponent into the ground. It is one of his best kill moves and is powered up when paired with rage.