Photon (フォトン) is a character that has yet to make a formal appearance in Deep-Sea Prisoner's creations.
Photon has white hair with messy bangs and yellow swirling eyes. They wear a dark blue hoodie with gray drawstrings and short pants. Their footwear consists of gray socks and a pair of dark blue boots with blue soles and a golden button at the side.
Photon was shown holding a bouquet of flowers and crying above Ivlis, who was under water, the title was written " To you, who will never shine," with words at the end “Goodnight". It is currently unknown what kind of relationship the two have.
- Photon's name is derived from photon, an elementary particle of light.
- They often appear with a submarine.