Seamoon is one of the most popular ships within the Cookie Run fandom, and it is potentially the most well-known as it has existed for quite a while. Pilot Doughnut Ball in the 2024 April Fools event Fanon After all, the moon and the sea are inseparable. Some things can't be stopped no matter how hard you try. When GingerBrave meets Sea Fairy on his quest to learn more about the curse, he discovers that Sea Fairy likes her new look because it's similar to the full moon that she adores so much. On 2024 April Fools day, Cookie Run releases a small event where cookies are transformed into ball-shaped doughnuts by an unknown curse.

This seems to imply that Sea Fairy has left to stay with Moonlight. The last paragraph of the story mentions how Sea Fairy and the Tower of Frozen Waves where she resides have mysteriously vanished without anyone knowing of their whereabouts, while a new legend mentions the dark side of the moon now having an ocean. The costume bond story tells a story of how Sea Fairy's longing for the moon is affecting her duty as the guardian of the sea, after which Moonlight Cookie reaches out to her, noticing her feelings and extending her hand out to her. The 'moonlight' is mentioned in Sea Fairy's costume once again. In update 4.2, they get a costume bond together and both receive the first legendary costumes: Rippling Moonlight and Crescent Guardian. The bond ends after the song also ends, before Sea Fairy can see her. This meeting happens on the dream world, were Moonlight hears Sea Fairy's singing. The bond describes the meeting of Moonlight and Sea Fairy. In 4.0 update they got a bond together called 'Sea Breeze Flowing Through the Stars'. In the official 'I Want You Every Day' MV, Sea Fairy and Moonlight are shown to the lyrics 'your love brought spring to an endless winter,' probably referencing Sea Fairy's feelings towards the moon and the impact it had on her. Peppermint Cookie states that her feelings to the moon must be very strong. On the penultimate floor, the final Memory Fragment says what Sea Fairy Cookie calls the Purest of Heart is at the top of the tower, as close to the moon as Sea Fairy Cookie could put it. In the event, Sorbet Shark Cookie translates a Memory Fragment where Sea Fairy Cookie says she may never return and wishes she could see the moon again. It is likely she used the waves she created to try and reach it, and they formed a tower when they were frozen, leading to the creation of the Tower of Frozen Waves. In the last three floors of the Tower of Frozen Waves event in Ovenbreak, the background shows Sea Fairy Cookie frozen while she reaches for the moon. In her Kingdom gacha draw animation, she is shown to be reaching towards the moon when the ice encasing her breaks and she is revived. Despite them never mentioning Moonlight directly, many of them reference her missing someone or recalling something in her past: presumably Moonlight, since she is an integral part of Sea Fairy's story. Her quotes in the original Korean version of the Cookie Run games are much more focused on love towards someone else, while in English they are more reminiscent of fate. Sea Fairy is often portrayed through canon material (voicelines, official arts, etcetera) to have a strong desire forreaching/loving the moon. Sea Fairy has been yearning to see Moonlight again since that day though the two have been featured together in comics commissioned by DEVSISTERS, those stories are not canon, and there is no indication that they ever met again after that day.

Sea Fairy had been cursed to turn into sea foam were she to ever release her sword, and was suffering greatly because of this-however, meeting Moonlight 'saved' her from her pain, though it's unclear as to how. Sea Fairy and Moonlight once met in the distant past.

Sea fairy x moonlight