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This is once in a lifetime event, don't you think that you could still make it?
— Isanari Uesugi
He has a distinctive golden, spiky hair and is mostly seen wearing a sunglass on his forehead with a bulked up and muscled body. Fuutarou five years ago also shared similar facial traits to Isanari.
Isanari has a wild character. Fuutarou five years younger is said to share the same personality as his father, notably both were bad at studying.
Isanari and Papa Nakano seem to have some history. It was through Isanari's connection with Maruo that his son, Fuutarou, became a tutor for the Nakano quintuplets.
- "This is once in a lifetime event, don't you think that you could still make it?"