Kanon

Sea Dragon Kanon
Sea Dragon Kanon(海龍のカノン, Shī Doragon no Kanon), also known as Gemini Kanon, is a character from the classic anime/manga series, Saint Seiya. He was the younger twin brother of Gold Saint Gemini Saga, and later took up the position after Saga's death. Before finally embracing his destiny as the Gemini Saint, Kanon masqueraded as the Sea Dragon, one of Poseidon's seven Marina Generals.

Personality
Kanon is a character of substantial importance in the Saint Seiya universe, as he was responsible for the Conflict of the 12 Temples by inciting his brother Gemini Saga to succumb to his dark side, and directly responsible for the resurrection of Poseidon, King of the Seas. Initially, Kanon is depicted as a man of treachery and vile nature, having attempted to use the god Poseidon and even his fellow Marina Generals to decimate the Saints, and thereby achieve domination over the world as soon as Athena and Poseidon executed one another. However, he soon redeems himself after taking the mantle of Gemini Gold Saint.

During his fight against Ikki, Kanon attempted to dispose of the Phoenix Saint using both Galaxian Explosion and his signature attack, Golden Triangle. However, both attacks failed to permanently get rid of Ikki, who mocked Kanon for being significantly weaker than his deceased brother Saga. Ikki then struck the Marina General with his Hōō Genma Ken. This caused Kanon to suffer terrifying hallucinations, the resulting rage fueling his Cosmo and making him ferociously beat down Ikki, who noticed the anger fueling Kanon's punches.

Siren Sorrento, who had discovered Kanon's treachery, intended to kill him using his Dead End Climax. As Sorrento was on the verge of finishing off Kanon, Ikki demanded him to stop, as he required information from Kanon. Sorrento stopped his assault, and Ikki inquired about Athena's Jar, a divine instrument used to contain the soul of Poseidon. Kanon smirked and said it was trapped inside the Main Breadwinner, alongside Athena herself.

As Kanon cackled at the thought of the Saints failing their duty to protect Athena, Ikki, who now felt nothing but disgust towards Kanon, left the battlefield. When Kanon inquired about where Ikki was going, he simply responded with a lack of interest in fighting Kanon, who he deemed unfit to fight. Sorrento also commented on this, noting his own initial perception of Athena being weaker than Poseidon based on her being the guardian of humanity, whom he perceived as rotten. However, he learned that Athena's strength came from the love and sincerity she felt towards mankind. He then told Kanon that his failure to understand this would mean that he was a scumbag who was too pathetic to even be granted the honor of being killed in battle. He then left the Marina General with his own thoughts.

Later down the line, Kanon abandons his Sea Dragon Scale, and instead wore the Gemini Gold Cloth, finally accepting the Gemini Gold Saint mantle Saga left behind when he died. While he is ultimately on Athena's side now and restored his honor as a Gold Saint, Kanon still retained his ruthless and harsh personality, such as when he berated Pegasus Seiya and Andromeda Shun for being hesitant to finish off their foes, as it was a weakness the enemy could easily take advantage of.

Techniques
Kanon is in possession of a few techniques, as both the Sea Dragon Marina General and the Gemini Gold Saint.

Galaxian Explosion: Kanon is able to gather his Cosmo, and then launch a galactic blast reminiscent of a supernova. Although it isn't as potent as Saga's Galaxian Explosion, it proved enough to cause critical damage to Ikki.

Golden Triangle: Kanon charges his Cosmo, which he then uses to trace the outline of a golden triangle, which he uses to create a dimensional wave that casts his target into an alternate universe.

Genro Mao Ken(Demon Emperor Fist): Directly borrowed from Saga, Kanon points at his target and fires a small energy beam from his index finger, which pierces the opponent's brain at lightspeed, directly attacking their mind. Saga used it to manipulate his targets through suggestion, and a weaker variation can be used to cripple the opponent's nervous system and leave them vulnerable.