Chōhi, also known by her true name Rin Rin and her style name Yokutoku, is a central character in the Shin Koihime Musō series, where she is reimagined as a young girl rather than the historical general. Her given name, Rin Rin, is the name she holds most dear and typically only permits those closest to her, such as her sworn family and trusted allies, to use. Her appearance is marked by a distinctive and bright yellow hairpin shaped like a smiling face, which acts as a whimsical reflection of her emotions, changing its expression to match her current mood. She is small in stature, which belies her immense physical strength and ferocity in battle, making her a deceptive opponent who can stand on equal footing with much larger warriors.

Her background is rooted in tragedy and loneliness, shaping her deep desire for companionship. As a young child, her parents were killed by bandits, leaving her orphaned. She was subsequently taken in and raised by her grandfather, a hunter who lived apart from the village. When her grandfather eventually passed away, Chōhi was left completely alone. To combat her profound loneliness and avoid being isolated again, she formed a group of child bandits known as the Rin Rin Bandits, using mischief and minor criminal acts as a way to create a surrogate family and a sense of belonging. This path of loneliness led her to a fateful encounter with Kanu, who would become the most important person in her life.

Personality-wise, Chōhi is a bundle of contrasting traits. On the surface, she is an energetic, cheerful, and talkative girl who approaches life with an ever-present smile. She is often naive about the complexities of the world, yet she can display sharp instincts and a cleverness that surprises others. Her loyalty is absolute, and she is fiercely protective of those she considers family, showing remarkable dedication to her duties. She will fight through any adversity, even severe illness, to fulfill her responsibilities and protect her loved ones. She is also known to be very powerful and strong, capable of competing against Kanu in armed melee combat.

Chōhi's primary motivation stems from her past trauma and her desperate need for a family. She craves stability, love, and a place to belong. This is most powerfully expressed in a vow of sisterhood she makes with Kanu. In Chōhi's eyes, this vow is not a formality but a sacred bond, and she dedicates herself entirely to being Kanu's younger sister. Her actions in the story are largely driven by a desire to protect this new family and the peaceful life they are building, ensuring that she never has to suffer the agony of solitude again.

In the story, Chōhi serves as one of the first and most loyal pillars of her faction. Alongside Kanu, she is one of the initial companions who discover and pledge allegiance to the protagonist. Her role is that of the fierce, unwavering younger sister and the powerful vanguard of the army. While Kanu provides leadership and moral guidance, Chōhi provides raw, unbridled power and a relentless spirit. Within the context of the narrative, a running gag often portrays her as one of the younger or less strategically inclined members, sometimes being excluded from important war councils due to her impulsive nature.

Her key relationships define her entire existence. The most significant is her bond with Kanu, who she sees as her older sister. Chōhi was the first to join Kanu, and their sisterly vow is the cornerstone of her emotional world. The arrival of Ryūbi creates an interesting dynamic. Initially, Chōhi is possessive of her place as Kanu's little sister and resistant to Ryūbi joining the family. However, over the course of the series, particularly into the third season, she warms up and accepts Ryūbi as another older sister, calling her Touka-neechan and expanding her cherished circle of family.

Chōhi undergoes a clear but subtle development. She starts as a lonely child acting out with a bandit group, transforms into a fiercely loyal and dedicated little sister to Kanu, and finally matures into a more secure and accepting member of a larger sisterhood that includes Ryūbi. She learns to expand her heart beyond a single bond, embracing a larger family without feeling her original bond is threatened. This journey from lonely orphan to a cherished member of a sworn sisterhood is the core of her character growth.

In terms of notable abilities, Chōhi is recognized as one of the strongest physical combatants in the series. Despite her small size, her raw destructive power is immense. In the visual novel from which the anime is adapted, her abilities are quantified as having the strongest damage output when used as a general in battle, though she lacks defensive techniques and is therefore not suited for a command role. She wields her strength with a childlike enthusiasm, often charging headfirst into the fray, making her a devastating frontline fighter capable of matching skilled warriors like Kanu in armed melee combat.