Tojiro Kusanagi, a 37-year-old computer engineer, is both a biological father to Tom and an adoptive parent to Mikan. Initially reluctant to welcome Mikan into the family due to his preference for dogs, he gradually transforms into a devoted, nurturing figure, bonding with her over shared drinks and imparting advice on life and relationships.

In the manga, he maintains a conflict-free, harmonious relationship with his wife, a trait that garners admiration from Kyoko, Tom’s love interest. The anime adaptation introduces layers of tension, showcasing moments like late returns home and disagreements over domestic expectations, such as unprepared meals.

His journey highlights adaptability and growth, evolving from hesitation to wholehearted acceptance of Mikan’s distinct traits. Balancing career pressures with parental duties, he shapes family dynamics through practical guidance and emotional reassurance. His parenting blends pragmatism with compassion, addressing daily hurdles and the nuances of welcoming a non-human member into their home, underscoring a commitment to fostering unity amid complexity.