Name: Masatada Monjushiro Role: Eldest Son A particularly important figure among the five in the original story. Masatada's defining characteristic is that he **"loves the piano."** His setting is that he works as an assassin solely to afford a life of playing the piano. Personality: • Calm • Rarely shows emotion • Has an extremely strong obsession with the piano • Possesses a unique set of values • Appears detached at first glance He works to maintain his lifestyle of playing the piano. Through the power of the "insect" inside him, he manipulates sound. He can use sound to attack or mimic other people's voices. In the story, he uses sound to deflect bullet trajectories or inflict damage on opponents with intense sonic blasts.

Name: Umaune Monjushiro Role: Second Son A comical character who is almost the polar opposite of Masatada. He is quite eccentric, often found sleeping on park benches and speaking with a unique, drawn-out lilt at the end of his sentences. Personality: • Cheerful • Airheaded • Does things at his own pace • Gets hungry easily • A bit off-kilter • Speaks to children with the same energy as anyone else. However, he isn't just a "character who thinks about nothing"; he possesses the distinct eeriness of a member of the Monjushiro family. Umaune has the ability to transform into an insect monster. Furthermore, his defining trait is the ability to molt during battle to change forms and power up. He also has a strange talent for judging the value of gemstones by rolling them around in his mouth.

Name: Sunayo Monjushiro Role: Younger Sister Appearance: She appears in the setting materials as a young girl with a slightly different impression than her brothers. Like Umaune, she is set to have the ability to transform into an insect monster.

Name: Kiwako Monjushiro Role: Mother Occupies a very special position among the five. Appearance: In the setting, she is described as a **"super beauty."** Personality: Since her detailed personality isn't depicted in the main story, there is little definitive information. A genius hacker. Unlike her sons, she is set as a person with talent in the fields of computers and information technology rather than physical "insect" abilities.

Name: Toshiomi Monjushiro Role: Father This character also has very few depictions in the main story and is introduced in detail through setting materials. Personality: Detailed personality is unknown. However, it is mentioned that he gave his family a strict upbringing, suggesting he was a figure who trained his children as the head of the Monjushiro family. Unlike his sons, Toshiomi is set as a "type who exerts superhuman strength while remaining in human form." In other words, he is not the type to "transform into an insect."

- Name: Shizuka - The young girl who serves as the central figure of The Monjushiro Brothers. - Her father, a police officer, was killed by Gendo Koshidake. - Left all alone after losing her father, she is sent to an orphanage called the **"Aijin-in."** - On her way, she meets Umaune in a park and requests that he kill Koshidake. - Although she is suspicious of Umaune and the Monjushiro brothers at first, her desire to avenge her father leads her to make the request.