"I"

"The Bearer of Nonsense".
His name is never revealed and other people call him by various nicknames such as "Ii-kun", "Ii-tan", "Inoji" ("the letter i"), "Damaged Goods", etc.
When he was a second-year middle school student, he entered the ER3 System and studied in Houston for five years but withdrew from it after the death of Omokane Magokoro. He is now a student at Rokumeikan Private University and lives in the antique appartment.