Kirawus is an Ainu man who becomes a supporting character in the final season of the narrative, aligning himself with the faction led by the former Shinsengumi commander, Toshizou Hijikata. Hailing from the outskirts of Kushiro in Hokkaido, he is the youngest child in his family and was born near that region. His motivations are grounded in a practical need to secure resources and aid for his village, which has suffered from a disaster, leading him to take on the dangerous role of a guide and interpreter for Hijikata's group.

In terms of personality, Kirawus is defined by his logical and pragmatic nature. He often serves as a voice of reason among the more eccentric members of his party, frequently questioning plans and offering more sensible alternatives. His straightforward and calm demeanor is paired with a sharp wit, which is often on display in his interactions with his companion, Kadokura. While he believes in luck to some extent, he prioritizes reason and is deeply devoted to the traditions, beliefs, and cultural values of the Ainu people. This devotion is evident in his respect for traditional hunting ceremonies and his knowledge of Ainu customs.

Kirawus's role in the story is primarily as a member of Hijikata's faction. He acts as a cultural bridge between the Ainu and Wajin (ethnic Japanese) due to his cross-cultural savvy, serving as both a scout and an interpreter. One of his most significant relationships is with Kadokura, a former prison warden. Their partnership is characterized by a dynamic of mutual respect and humorous banter, with Kirawus often teasing Kadokura and questioning his sometimes unfortunate decisions. He also develops key relationships with other main characters early on. When he first meets Asirpa, he questions why she uses a traditional bow instead of a more powerful rifle, showing his practical mindset. He becomes involved with Sugimoto and Tanigaki during the Shiton Anehata incident, where he initially suspects Tanigaki of a crime before the misunderstanding is resolved.

Throughout his time with Hijikata's group, Kirawus demonstrates notable development. He proves himself to be dependable and capable, moving from a relative outsider to a trusted member of the team. He participates in several key missions, including tracking the convict Youichirou and formulating a plan to rescue Hijikata from the prisoner Waichirou Sekiya. During the hostage crisis, Kirawus is skeptical but quick to adapt, devising a plan to tail Sekiya and offering a precious knife carved by his father as a tool for Kadokura, indicating his willingness to take significant risks.

Kirawus possesses several notable abilities that make him an asset. As an Ainu man, he is a skilled hunter and has a deep knowledge of the Hokkaido wilderness. He is proficient with a rifle, which he typically carries when traveling, and is also capable of preparing traditional food like shishiamo smelt. His knowledge extends to identifying animal parts, such as recognizing a tufted puffin ornament, which helps Hijikata's group navigate their journey. He is also intimately familiar with Ainu hunting and ceremonial practices, such as the specific method for skinning a brown bear and holding the Kamuy Hopunire ceremony to send off the bear's spirit. His ability to translate and interpret between cultures is central to his role, as is his sharp hunting instinct and grounded, rational mindset.