Ryūsei Kenzaki

, commonly referred to as, introduced during an anime exclusive arc, is a servant of Rurichiyo Kasumiōji, the princess of the Kasumiōji noble family.

Synopsis
Ryusei first appeared with Rurichiyo Kasumiōji and Rusaburō Enkōgawa(Enryu) in the world of the living without any gigai. When Rurichiyo wanders off, the two are forced to remove her from the scene, as hoards of hollows were approaching. They stand on the sidelines and he is seemingly impressed when Ichigo using his Bankai to disperse the creatures. Later, they appear to be living next to Ichigo and attending his school. Due to their overprotective nature, Ichigo is weary of Ryusei.

After Ichigo's battle with Hanza Nukui, Ryusei explains that he and Enryu were assigned to protect Rurichiyo from a member of her clan, Kumoi, who plans to kill her in order to gain power. She later enters her family compound and is protected by Kenpachi Zaraki. However, she still decided to marry Shu Kannogi in order to keep Kumoi in line.

Rurichiyo's clan is revealed to be the creators of the Bakkōtō, a device that steals the users spiritual energy in order to make it stronger. As a result, the new 3rd Division captain, Shusuke Amagai, joins Ichigo and cuts down the assassin forces. Shusuke scueeds in killing Kumoi, but takes Rurichiyo to Yamamoto, who he intends to fight. However, Ichigo intervenes and uses his hollow powers to save Rurichiyo and defeat Shusuke.

Ryusei, along with Enryu, follow her back to her clan, where they will serve as her body guard once more.

Zanpakutō



 * Shikai: is released with the command . When released, it takes the form of a long black sword with five flowers attached to it; two flowers on either side and one on the tip.


 * Shikai Special Ability: The flowers release a pollen which causes more flowers to bloom on his opponent's weapon, rendering it useless. The flowers will wither if the pollen is blown away. Kenryū can also scatter the flowers on the blade to blind an enemy to allow in the aid of Rurichiyo's escape in battle.


 * Benishidare's secondary ability. He can then use the scattered flowers to rain large energy needles down on his foe.


 * Bankai: Not Yet Achieved