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Aries Taurus Gemini Cancer Leo Virgo Libra Scorpio Sagittarius Capricorn Aquarius Pisces
Saints of Aquarius
The Aquarius Saints as as cool and collected as the ice that they wield. They know how to stay calm under pressure, like to think things through, and don't let emotions control them in battle. Yet, under the frosty exterior, they care deeply for those close to them, and are always ready to sacrifice themselves for a worthy cause. Camus is the Aquarius Saint of modern times in the original Saint Seiya, while Degel is the Aquarius Saint of the 18th century in Lost Canvas.
Aquarius Cloth

Aquarius Camus
As expected from a master of the cold, Camus
prized a level head and stoic discipline. He believed
that a true fighter must be as dispassionate and resilient
as the Arctic icebergs, and he tried to cultivate these values
in his two students: Isaac and Hyoga. Hyoga, on the other hand,
was a hopeless emotional wreck who clung desperately to the past.
Camus knew that Hyoga couldn't possibly last against a Gold Saint
like that, so he took drastic measures to shock Hyoga into shape. He
took away the thing Hyoga cared about the most: access to his dead
mother. He truly hoped this would help Hyoga become stronger, but
  when it only broke him further, Camus froze him in an ice slab for
   his own good. He would rather Hyoga sleep through this conflict
  and awaken in more peaceful times. Hyoga managed to get
   free, however, and confronted his Master again. This
  time Camus wouldn't be as merciful. He went all out on his
  student, pushing Hyoga past his limits.
  Camus was a harsh mentor, but
  his feelings for Hyoga ran deep, and he
was glad to sacrifice his life to teach
Hyoga all that he knew.

Aquarius Degel
Degel was considered the most intelligent
Saint in Sanctuary. He owed much credit for this
to the time he spent in Bluegrad, home to a treasury of
the world's widsom and the guardians of Poseidon's Legacy.
It was a remote, desolate place, with little sunshine or warmth.
There, Degel and his best friend Unity made a pact. Degel would
become a Saint, Unity would become a ruler, and together they'd
create a bridge between Bluegrad and the rest of the world.
Degel kept his promise to become a Saint, so when Athena sent him
back to Bluegrad to retrieve Poseidon's Legacy, he was happy to see
his old friend again. Unfortunately, in the years Degel's been gone,
Unity went a wee bit crazy. He chose to be a Marina of Poseidon,
killed his father, offered his sister's body to the god, and now
wanted to rule the world. Degel was heartbroken at how far
his friend had fallen, but he did not give up, and managed
to get through to Unity's old self. But by then it was
too late. Poseidon's Legacy went out of control,
and Degel was forced to sacrifice himself
to contain the sea god's wrath.

Aquarius Techniques
Diamond Dust Diamond Dust
Aquarius is able to slow down the movement of atoms in the air, thereby creating frost, and launching it at his opponent in a cold blast of ice crystals.
Kol'tso Kol'tso
Although the screenshot is from Camus' student Hyoga using the attack on Scorpio Milo, Episode G clarifies that this is a technique in the Aquarius arsenal. It is created by freezing water molecules around an opponent into a ring that restrict their movement. Indeed, "kol'tso" means "ring" in Russian. Over time, the number of rings increase and tighten on the target.
Long Range Blast Long Rang Blast*
Aquarius could send a beam of Cosmo over a long distance. More specifically, he uses this to blast a hole through the Arctic ice and sink the ship with Hyoga's dead mother to a depth beyond his reach.
Freezing Coffin Freezing Coffin
Aquarius can freeze the moisture in the air around a target to create a block of ice around them. It has a long casting time so is probably not effective against moving targets. Although Camus claims that the freezing coffin lasts for hundreds of years and can't be broken even by the combined strength of the Gold Saints, Shiryu breaks the coffin with one of Libra's weapons, and Minos Griffon punched through it when Hyoga tried to use it as a shield. Soo... yea. It can also be broken out of from the inside by using one's Cosmo to raise temperature above that of the coffin.
Aurora Execution Aurora Execution
This is Aquarius' most devastating attack, charged by raising both hands overhead and then swinging them down, releasing a stream of coldness approaching or even reaching absolute zero. Those hit Aurora Execution die instantly as the movements of their atoms grind to a freezing halt.
Group Techniques
Athena Exclamation (Light) Athena Exclamation
The honor code of the Saints dictates that all battles must be one on one, but Athena Exclamation can only be performed by three Saints. It has the force of the Big Bang, and is so overpowered that Athena herself had it banned. However, Saints have been known to use it under extreme circumstances.
Athena Exclamation (Dark)
Supernova Sunlight*
The Zodiac constellations have long bathed in the light of the Sun, and the Gold armors that represent them have absorbed an infinite amount of sunlight. To perform this incredible blast of energy, all the Gold Saints focus their Cosmo into the tip of Sagittarius' arrow, thereby fusing their powers as one.
This attack was used to break through the Wailing Wall by bringing the full intensity of a star into the darkest depths of Hell. Although it is said that Athena Exclamation has the force of the Big Bang, Supernova is undoubtedly more powerful, since it utilizes the combined strength of twelve Gold Saints instead of three. It instantly disintegrates everything in its vicinity, including those who cast it, and sends waves of devastation rippling outwards. 
Aries Taurus Gemini Cancer Leo Virgo Libra Scorpio Sagittarius Capricorn Aquarius Pisces

Knights of the Zodiac

*This technique does not, as far as I know, have an official name. I just gave it a descriptive name.

Saint Seiya (also known as Knights of the Zodiac), all of its spinoffs (Lost Canvas, Episode G, Next Dimension, etc), all characters, art, and story is copyright Masami Kuramada. No copyright infringement is intended.
Credit for Kol'tso and Freezing Coffin pictures to SaintSeiyaPedia, and for the Saint Cloth picture to Pharaon Website.