A red haired Solver with the title, 'Galileo'. He solves puzzle for money purposes and is often trying to get ahead of Kaito in order to claim the purported treasures offered by the POG. He appears to have a crush on Nonoha. Gammon holds a very competetive rivalry to Kaito. He calls him "Bakaito", a combination of Kaito's name and the Japanese word "baka", meaning idiot. Kaito and him seem to have quite a few similarities, their hot temper being the most obvious.
Gammon is always seen with his leahter jacket and pants, giving him a delinquent appearance along with his hairstyle and his way of talking. He also rides a motocycle.