"Hideo Akiyama is one of the main characters in the manga series ""Blood Revenger."" He is a skilled fighter and a member of the Akiyama clan, who are known for their unparalleled combat abilities. Hideo is also the older brother of the protagonist, Aki Akiyama.

Hideo is a tall and muscular man with short black hair and piercing blue eyes. He is usually seen wearing black leather clothing and a red scarf around his neck. Hideo is a stoic, serious, and determined individual who is fiercely protective of his younger sister, Aki. He is always calm and collected, even in the face of danger or adversity.

Hideo is known for his exceptional strength and speed in combat, as well as his mastery of a variety of martial arts techniques. He is also a skilled strategist and tactician, able to quickly analyze a situation and come up with an effective plan of action. Hideo has a reputation as one of the best fighters in the Akiyama clan, and is respected and feared by his fellow clan members.

Despite his intimidating presence and formidable combat abilities, Hideo is a deeply caring and compassionate person at heart. He has a strong sense of justice and always strives to protect the innocent and uphold what is right. Hideo is also fiercely loyal to his family and friends, and will not hesitate to put himself in harm's way to protect them.

Overall, Hideo Akiyama is a complex and compelling character who adds depth and intrigue to the ""Blood Revenger"" manga series. His impressive combat skills, unwavering determination, and fierce loyalties make him a force to be reckoned with, and a fan favorite among readers."