Kageyama Reiji

Kageyama Reiji/Ray Dark (影山零治) is a main antagonist in books 2-4 and a protagonist in books 4-5, then reverting back to his creepy ways, although he is not specifically an antagonist after Book 5. He worked alongside Kenzaki, Garshield and (at one point) Segata Saiyou. He has a strange relationship with Kidou Yuuto and other Teikoku players, but specifically Kidou.

Family

 * Nephew: Kageyama Hikaru

Story
He is shown to be a very nasty and cunning person in books 2-4 and revives Shirou's father and Yagami Kyouhaku in Book 3. He is the title of the book - the Villain of Death. He can bring evil people back to life.

Kageyama helped kill Osamu, who was later revived by the Hero of Life.

Endou Daisuke, the Hero of Life, is his direct opposite, and Endou doesn't like him after what he did to the original Inazuma Eleven, even though he became a good person after that.

Power

 * Brings evil people back to life