Obi is currently an aide that stands by Prince Zen's side, along with Mitsuhide and Kiki. He was a former assassin that was hired by Lord Haruka to prevent Shirayuki from entering the castle and meeting Zen. Surprised by her wit and bravery, and mildly curious about Zen, he hands himself over to Zen calling him "Master". Soon after, Obi is hired as Zen's attendant before being officially raised as a messenger and placed as Shirayuki's personal guard. He is later promoted to Zen's Immediate Knight whilst still remaining Shirayuki's guard.

Obi is rather an aloof character and whilst he holds Prince Zen Wistaria and Shirayuki dear to him, he holds them at a distance not wanting them to know very much about his past. Obi continues to utilize the skills and knowledge from his previous line of work to find information to protect Zen, Mitsuhide, and Shirayuki, and to pursue those that seek to harm them and threaten his new lease on life.

He should sound like a comedic relief character for this production, as he is mostly a silly tease to others, while also being mischievous.