|Occupation||Head of the Inoyama Family|
|Alias||Kei (by Kyouichi)|
|Manga Debut||Chapter 23: The Crying Ox and the Cat|
Kenji has short hair parted from the right. Some of his hair sticks up and his bangs come to the left. He has a large cross scar on the right side of his face, coming from his forehead down through his right eye to his cheek.
He is energetic and usually acts casual with most people. He is childish most of the time and likes to show his strength.
Kenji (健児): Ken (健) means "healthy," "strength," or "persistence." Ji (児) means "child." Both of these refer to his personality.
Inoyama (亥山): Ino (亥) means the "twelfth sign of the Chinese zodiac, the sign of the boar." Yama (山) means "mountain."
Kenji and Kyouichi are close friends. They often challenge each other in games and joke with each other casually. Kyouichi calls Kenji, "Kei."
He sometimes hangs out with him, and he used to follow Keitaro all the time.
He has a crush on her.
He frequently ticks her off, and he has become afraid of her.