Hyperion

Hyperion (Ὑπερίων in Ancient Greek) is the Titan of light and the father of Eos, Helios, and Selene by Theia, the Titaness of sight and enlightenment. Hyperion's name means "watcher from above" or "he who goes above" from the greek words hyper and iôn. One of the twelve original Titans, Hyperion was imprisoned in Tartarus after the Titanomachy and was eventually released during the second Titan war to fight against Olympus.

History
Like his siblings, Hyperion was born to Gaea and Ouranos, the earth and sky. After his brother's rise to power, Hyperion was named lord of east. He later took his sister, Theia as his wife and fathered the dawn, moon, and sun gods by her. Hyperion fought for Kronos in the first war against the Olympians and was cast, along with many of the Titans, into Tartarus after their defeat.

Appearance
Hyperion is described by Percy to be strong and tall with eyes like miniature suns with a harsh light. He was wearing golden armor and wielded a long golden sword during his brief battle with Percy.

Percy Jackson and the Olympians
The Last Olympian Hyperion was first shown in a dream on Mount Tamalpais talking to Krios about Prometheus and the trap for the Olympians. He also mocked Atlas who was complaining that he wanted to fight and that someone should take the sky from him.

Hyperion was the only other Titan besides Kronos shown fighting in the battle of Manhattan (Prometheus didn't fight). He led an army consisting of Scythian Dracanae, demigods, and Laistrygonian giants into Central Park, where he was intercepted by Percy, the Athena Cabin, Artemis' hunters and the nature spirits led by Grover and Leneus. He dueled Percy and Percy, with a new-found power, created a hurricane long enough for Hyperion to be trapped in a maple tree by the satyrs and nymphs. It is unknown if Hyperion would be able to escape from the tree when reaching his full form, or even if he could reform at a later time in Tartarus.

Powers
In The Last Olympian, it is shown that Hyperion can manipulate light (and fire) and control it. He can also surround himself with light, light himself on fire, and move at extreme speeds. He can walk on water, and he can "suck a Greek fire-bomb into his palm" (destroying it). Like Kronos, he could also blast people backwards just by emitting "titanic" energy. Next to Atlas, he's the greatest Titan warrior.

Trivia

 * A moon of Saturn is named after Hyperion. It was the first non-round moon to be discovered.
 * Hyperion is weaker when he's wet.