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On the left, Saga the elder. On the right, Kanon, the younger brother. Gemini saint are twin brothers.

Gemini Saga is from Knights of the Zodiac: Saint Seiya. Mun and muse is +21. As his name implies, he's the Guardian and Gold Saint of the Gemini constellation and is one of the 12 strongest knights of the Zodiac.

Mini bio / personality
He is often described by the other characters as having the kindness of an angel but with the darkness of a demon. This ambivalence ended up creating a split dual Jekly/Hyde personality: a good Saga that was extremely loyal to Athena, and an evil one that keeps control of the body most of the time. When it takes control of Saga's body, his hair turns from blond to jet-black (the color schemes were altered for the anime, in which Saga's normally blue hair turned light grey). Saga's two "sides" can also communicate between themselves; in a dialogue, the good Saga reproaches his evil "side" to have forced him to hurt Athena.