Masayoshi Watsuki

Masayoshi Watsuki (和月正義, Watsuki Masayoshi) is the brother of Inani Watsuki. He is commonly referred to as "Mayo" by Inani, and he plays an important role in the introduction of Niji The Cat.

Appearance
Masayoshi is taller than average, and has medium-length black hair. He has green eyes, similar to his sister's, and can often be found wearing business casual clothing.

Personality
Masayoshi has a calm and collected nature. He has a realistic state of mind but is relaxed. Despite his studious exterior, Mayo has had his fair share of action with the Rainbow Team. He has been known to assist Inani and Niji when times are tough with profound wisdom and knowledge.

Early Life
Masayoshi lived with his mother and younger sister during high school. After high school, he decided to study abroad which would leave Inani to fend for herself for the first time, as their mother was often busy working. To make up for this loss, Mayo gives Inani a tabby cat named Niji to guide her.

Black Katanas
When Masayoshi was 15, he became jealous of how powerful and talented his sister appeared to be. Masayoshi went on to form a group of individuals known as the Black Katanas who had the power to absorb colour and energy from the world. While not a demon himself, the other members were. One day, while Inani was sleeping, Masayoshi climbed to her bunk and inflicted Inani with darkness, which would remain in Inani forever. Before Masayoshi could finish, he stopped and started to cry, regretting his actions. Despite Masayoshi never finishing the ritual, Inani was still harmed. Masayoshi immediately disbanded the Black Katanas.

Masayoshi lived in regret for multiple years and never encountered the Black Katanas again until he was 18. A week before graduating, Masayoshi found a white card with the Black Katanas emblem (three katanas in a triangle) on it. Scared that he would get his sister involved, Masayoshi left his home to study abroad so that he could avoid the Black Katanas and also keep his sister safe.

Inani Watsuki
His sister, Inani Watsuki, is one of the closest relationships that Masayoshi has. Despite their differences, they are mutually supportive of each other. Their bond is deep and Masayoshi hesitates to tell Inani that he will study abroad. Growing up, the two spent most of their time together, as noted by their mother.

Niji the Cat
Although little one-on-one interaction is shown between Masayoshi and Niji, it can be assumed that the two are close due to Masayoshi acquiring and giving the cat to Inani as well as spending time with Niji when he was younger alongside Nagisa.

Nagisa
Nagisa is one of Masayoshi's childhood friends. There is a great amount of mutual trust and despite differing in their paths, get along really well. Masayoshi is saddened that his relationship with Nagisa has deteriorated but is happy that they were able to enjoy their own life.

Quotes
"Inani, don't let me down."