"Mitsuru is a key character in the Japanese manga ""Second life of a Gangster"". He is introduced as a young man who appears to have lived a rough life, with scars and tattoos on his body. Mitsuru is a member of the Yakuza, a notorious Japanese mafia, and serves as a henchman to the gang's boss.

Throughout the manga, Mitsuru is shown to have a hot temper, often lashing out violently when provoked. His loyalty to the Yakuza is unshakeable, and he will stop at nothing to protect his gang and its interests.

Despite his tough exterior, Mitsuru has a kind heart and shows compassion towards those he cares about. This is particularly evident in his relationship with the protagonist of the manga, a young man named Kenji. Despite Kenji's initially hostile attitude towards Mitsuru, the two eventually become close friends, with Mitsuru acting as a mentor and protector to Kenji.

In addition to his loyalty and compassion, Mitsuru is also a skilled fighter and strategist. He is often called upon to lead the Yakuza in battles against rival gangs, and his quick thinking and expertise in hand-to-hand combat make him a formidable opponent.

Overall, Mitsuru is a complex and multifaceted character who plays an important role in the world of ""Second life of a Gangster"". While his violent tendencies and allegiance to the Yakuza may make him appear intimidating, his loyalty and compassion towards those he cares about make him a compelling and sympathetic character."