Ryoma's long lost older half-brother who is frequently seen eating oranges. Ryoga is Nanjirou's first child from a previous relationship prior to meeting Ryoma's mom, Rinko. Though they grew up together as kids, Ryoga was forced to separate from Ryoma after Ryoga's aunt from his late mother's side won a custody battle with Nanjirou. It is unknown how old Ryoga actually is since he's apparently not a student, though given the rules of the U-17 camp, he would have to be 15–17. Like Ryoma, Ryoga possesses a cocky and fearless demeanor, but is less stiff and doesn't give people the silent treatment as often as Ryoma would. He frequently teases Ryoma over little things and calls him "chibi-suke". He takes the No. 4 slot of the U-17 first string while they were abroad and trains Ryoma to prepare him for the world cup. Despite his immense skill level, Ryoga seems to have little interest in team competitions or even becoming a pro, and would rather just have a real match with his little brother, echoing the dream Nanjirou had for Ryoma when the former retired from being a pro. Shortly after Ryoma gets kicked out of the U-17 camp, Ryoga leaves his position behind as well and gets Ryoma to follow him to join the U-17 American team instead. The full extent of Ryoga's abilities remain unknown.