Musca Dio (or Dios in the anime adaption) is one of Athena’s 24 Silver Saints that fights for peace and justice on Earth.
Algethi took Seiya by surprise and attacked the Bronze Saint. But the
attack was interrupted in mid-air by Dio who wanted a piece of Seiya and thus used his attack “Dead End Fly” on him. But his attack was also interrupted, this time by Sirius who said they should compete for the final blow. Thus Algethi threw him up in the air once more and the three Silver Saints prepared to finish him of the fastest they could. But suddenly Seiya disappeared, he was taken in by the Sagittarius Gold Cloth and defeated the Silver Saints in an instant
In The Lost Canvas, the unnamed 18th Centruy Musca Silver Saint was sent to Italy along with Auriga Saint, Sagitta Saint, Canis Major Saint and Cerberus Saint to investigate Specter activities surrounding a cathedral near a forest, where they were killed by Specters. Unlike Auriga, Cerberus and Sagitta, he was not resurrected by Hades.
Musca Fly is the traitorous, overweight Musca Silver Saint, who tries to steal Kouga and Yuna’s Bronze Cloths, to be promoted within Mars’ ranks. Fly can use the element of Wind.
The Musca constellation was created originally as the Bee, Apis, to feed the Chameleon constellation. It was later changed to Musca, the Fly, to avoid confusion with the Apus constellation.. A mythological connection could be made between the Musca constellation and the myth of the Titaness Metis. Metis had been Zeus’s first wife, the mother of Athena, and had helped free her husband’s siblings from their father, Kronos. However, after Zeus had assumed control of the world, he learned that if Metis bore him a son, that son would overthrow him the way Zeus had overthrown his own father. The king of the gods sought advice from his grandparents, Gaia and Uranus, who tell him he must destroy Metis. One day, alone together, Zeus lures Metis to him by talking to her sweetly. Once in his grasp, Zeus changes his wife into a fly and swallows her whole, averting the prophecy.