Isurugi Raijūta is the leader and founder of the Shinko-ryū "school" of kenjutsu - an organization whose purpose is to revitalize Japanese kenjutsu through force. Having conned his way into the good graces of the wealthy Tsukayama family, Raijūta seeks to fund his organization and crush anyone who stands in his way.
Raijūta is a tall and muscular man with defined facial features. He has short spiky brown hair, black eyes, and thick brown eyebrows. He wears a purple shirt under a dark green haori with reddish fur on the shoulder area, brown pants tucked into blue-green shin guards which are connected to sandals, and blue-green vambraces.
Raijūta is cocky and self-glorifying. He desires to impose fear on others to make himself feel more powerful. While he is not a bad swordsman by any means, his greatest weakness is his fear of killing others, deciding instead to knock them out or give them near-irreversible injuries.
- Shinko-ryū: His personal army, which fronts as a kenjutsu school, which he seeks to use as a means of destroying all other schools of swordsmanship.
- Tsukayama Yuzaemon: His former employer, whom he tricked and eventually betrayed so he could gain access to his vast wealth and large property.
- Tsukayama Yutarō: His former student, whom he betrayed and crippled to never wield a sword again.
Being a leader of his own group of followers, Raijūta has a fair amount of skill, but his immensely bloated ego and overconfidence in his abilities only make a mockery of himself. Using the initial form of his "Izuna" technique, he can snap other shinai and leave a slash-like indentation on the floor at the same time, which Kenshin speculates is powerful enough to snap even diamond if used with a real sword. However, because he is so much slower than Kenshin, dodging this attack proves to be nothing to him, and he is forced to unveil his ace, the "Tobi Izuna" - which swings in mid-air with a greater arc and produces a wind-blade capable of causing immediate amputation if not dodged.
Even with both these attacks however, Kenshin still makes a laughingstock of him using only his left arm for a Hiryūsen attack, defeating him with but a single blow. All in all, he is all talk and boasts no notable strength in comparison to Kenshin's previous enemies, such as Udo Jin-e and Shinomori Aoshi. Later on, Saitō Hajime states that for Kenshin to receive even a single cut from a "fool" like Raijūta, proved how weak he had gotten as a Rurouni.
A warrior fighting against the pacification of Japan, Raijūta attempts to build an army of the most powerful bandits to rebel against the new Japanese government. In order to accomplish this, he saves Yutarō, the child of a rich family, in order to acquire the resources to build up his army.
Raijūta's fighting style Shinko Ryū has the ability to create a long distance attack that travels through the air with the force of his Katana. This attack results in a sever injury to Yutarō's arm, to such an extent that the nerves were permanently damaged.
Unfortunately for Raijūta, his plot of a full-scale rebellion (as well as his overinflated ego) are quickly brought crashing down to the ground by Kenshin, who not only shows Raijūta what real swordsmanship is but also leaves him scarred for life as punishment for ruining Yutarō's dreams.