Sky is a master of lightning and arcane - he originally entered the world when a scientist was experimenting with some cells in a laboratory inside Dimension 0. After escaping Dimension 0, he entered the TTC in Dimension 618.
Sky is a little known artist and assassin, and was the former Deputybto the Voice of Light (TheGeneraless) in the Circle of Light. He often takes requests for Triangulum portraits, and spends much time inside his own laboratory, experimenting with anti-gravity.
To the lower right is a screenshot - the Triangulum depicted inside the project is one of the only known photos of Sky.