Libra Dohko (天秤座の童虎 Raibura no Dōko?, Dōko meaning "young tiger") s one of the oldest characters in the manga next to Aries Shion, as they both appear in the previous Holy War, and is most known by his role as Dragon Shiryu's mentor. He is also referred to as Old Master (老師 rōshi?) by all of the Saints of Athena as a sign of respect, even though his only true student is Shiryu. Many fans mistakenly believe it was not until the Hades arc of the manga that his true name was revealed by Shion, but Masami Kurumada had revealed it long before, as it can be found in promotional items, such as playing cards. He even revealed Dohko's young form silhouette in one of the cards. At the beginning of the Holy War in 1747 the young Dohko is promoted from a Bronze saint to the Gold saint of Libra. As he became one of the survivors of the ancient Hades War, after the war, Shion was assigned to be the pope of the Sanctuary while Dohko was assigned to guard the seal of Hades. (see Suspended animation ) Dohko on the other hand received a miraculous ability known as Misopetha-Menos, a way to preserve youth indefinitely.
As a normal person has about 100,000 heartbeats per day, Dohko has about 100,000 heartbeats per year with the help of the Misopetha-Menos. Relatively speaking, the 243 years is a mere 243 days for Dohko. This enabled Dohko to live a long life, shrunk from his normal average human size to the one of an old purple man. The condition was that Dohko must stay in the Mount Lu as a watchguard. As the time Hades will be unsealed, Dohko can be prepared to fight off Hades and his Spectres with his youthful body. This divine gift is a secret that even Shion, the former Pope, was unaware of. It is also for this reason that he is exempted from mandatory meetings in the Sanctuary.
As a Gold Saint, Dohko has mastered the 7th sense, giving him great strength and the ability to move at the speed of light. He also achieved the 8th sense so he could go to the Tartarus.
Dohko has shown some telekinetic abilities as well as telepathy. Although he only showed a few techniques during the story, it is implied that he can use all the techniques that Dragon Shiryu can (except Excalibur), since he taught him those techniques. Even so, the only techniques he has officially performed to date are:
Rozan Hyakuryu Ha : Mount Lu One Hundred Dragons Force (廬山百龍覇 Rozanhyakuryūha?): Dohko's ultimate attack. It takes the form of one hundred dragons.
Note: in the Anime-only Asgard arc, he was shown use the Shoryuha in a flashback to his youth. As the Asgard arc doesn't exist in Kurumada's manga, Dohko's appearance in it differs from Kurumada's official design.
Misopheta-menos: A gift from Athena herself. It slows down Dohko's metabolism in order to extend his life span for various generations.
Dohko's armor, the Gold Libra Cloth, contains 6 pairs of weapons to be used by the Gold Saints. Despite this, those weapons should not be used freely and it is up to the Libra Gold Saint to determine when they are needed. The weapons of Libra are 2 Swords, 2 Tong-Fas, 2 Lances, 2 Nunchakus, 2 Three-section staves and 2 Shields attached with chains.