Dark Blue Moon is a humanoid Stand with aquatic features. It manifests itself as some sort of merfolk-like entity with a flat head, four eyes, a large dorsal fin lining most of its back, additional fins on its legs, and webbed hands and feet.
According to JOJOVELLER, his form was made while thinking of a combination of vital strength and of mineral material.
Befitting its name Dark Blue Moon is consistently portrayed across media as being blue with red articulations.
Color Schemes
The series is known for alternating colors between media, the information presented below may or may not be canon.
Colored MangaSFC GameHftFAnime
Body(Dark blue and light cyan)
Eyes, articulations and pattern(Clay red)
Fins(Blue)
Body
(Dark cyan and dark purple body, dark cyan fins, dark purple pattern)
Eyes(Dark red)
Body(Blue and green body, green fins)
Eyes(Yellow)
Pattern(Red)
Body(Dark blue and blue)
Eyes(Light yellow)
Pattern(Magenta)
Articulations(Dark magenta)
Fins(Light blue)
Personality
Dark Blue Moon represents the Tarot Card The Moon, which symbolizes trouble in water, lies, betrayal, and fear of the unknown.[1]
Abilities
Underwater, Dark Blue Moon can even challenge Star Platinum
Dark Blue Moon is a marine Stand, and, as such, its skills are more effective in an aquatic environment. It is probably less effective in a terrestrial environment, but this is unknown.[1]
Dark Blue Moon has a high enough range that it was able to attack Jotaro without the user even being in the water. Its user has stated that it swims faster than any fish in the sea,[1] a trait proved to be true when Dark Blue Moon manages to create a giant whirlpool by simply spinning its webbed feet fast enough.[2]
Its Stand User also has an incredible lung capacity, being able to hold his breath for up to a personal record of six minutes and twelve seconds, which helps the Stand to maintain a battle, even if the user is thrown into the water.
Dark Blue Moon's hands are strong and sharp in water, making them effective weapons. Because of their sharpness, they are strong enough to destroy a still-running engine propeller and slice a shark in two with ease.[2][3]
Razor Scales
Dark Blue Moon can also use its scales as projectiles, throwing them against the enemy.[2]
Barnacles
Dark Blue Moon is capable of creating barnacles, specifically acorn barnacles, as seen when they attach to Star Platinum soon after making contact with Dark Blue Moon's skin.
The barnacles drain the target of its strength and also allow Dark Blue Moon slight control over the infected body parts, allowing it to drag its foes back into the water if they try to escape.[2]