Tyson

Tyson is a Cyclops son of Poseidon.

History
Tyson is the son of the Greek god of the sea, earthquakes and the father of horses (which reflects on Tyson's personality because he loves horses), Poseidon and a nature spirit. He is a young Cyclops (only seven years old in Cyclopes years) who tries to be the best little brother possible and make his family proud of him.

He met Percy at school, where he had been admitted as a school project, so that the students could be exposed to a homeless child and record his changes and what not. The Mist obscured mortals' view of Tyson's one eye, with the Mist making them think he had two. Percy simply assumed he had two eyes because was unable to look up past Tyson's mouth and nose, since he usually had peanut butter stuck in his teeth, making him rather hard to look at. Tyson has severe scars on his back that were caused by a sphinx in the substation where he used to live. He saves Percy's life in their school gym (burnt down due to fireball throwing Laistrygonian Giants). Annabeth also gave him permission to get through the magical borders of Camp-Half Blood because he is technically not a demigod. He saved the camp by fighting the bronze bulls that Percy and Clarisse La Rue could not stop alone.

In his first summer at Camp Half-Blood, Tyson made Percy a shield with all their adventures over the quest engraved on it and also rigged it to shoot out of a watch.

Tyson is a Cyclops, who are all half-brothers of Percy Jackson. They are considered "accidents" and generally looked down upon. Though Percy is at first disgusted to realize that he was related to him in The Sea of Monsters, he completely changes his opinion by the end of the book. As such, Tyson is closer to Percy than any of his brethren, and Percy even once announced that Tyson was his "baby brother" when he won the chariot race due to Tyson's help in constructing the equipment. Because of being a Cyclops heat does not hurt him. Tyson also likes peanut butter and loves Annabeth.

Tyson is the age of Percy in human years, but as mentioned, he is 7 years old in Cyclops years. He acts like this age and speaks like this age so that is why it may occur that he is different than Percy even though they are the same age. Tyson is an extraordinary metal-worker. He is sent under the sea to Poseidon's weapon armory. He works very quickly and repairs Percy's shield several times.

The Sea of Monsters
Tyson makes his first appearance in The Sea of Monsters. He is Percy's class' community service project. He goes on a quest through The Sea of Monsters in order to find The Golden Fleece, with Annabeth and Percy

The Titan's Curse
Tyson only appeared in various cameo appearances. One time being in an Iris message between him and Percy, because Tyson was still in Poseidon's underwater forges making weapons, and the book was landscaped in winter, so he couldn't come to camp.

The Battle of the Labyrinth
Percy comes back to Camp Half-Blood to find Tyson already there cleaning the room for inspection (With a couple perks too: A metal flock of horses, undersea plants that glow and scrubbed anemone that gleam in the light) and has mended Percy's wristwatch-shield. Annabeth leads the quest into the Labyrinth, and is very excited since this is her first time leading one, and one of her dreams (along with being an architect). She broke the rule of only two companions on a quest, by choosing Percy, Grover, and Tyson. Annabeth descends into the Labyrinth with Percy, Grover, and Tyson to find a way to stop Kronos's evil forces from entering the borders of Camp Half-Blood by searching for its inventor, Daedalus. As they go into the Labyrinth, they face many dangers. Tyson then finds Briares the Hundred-handed one, but is disappointed to find out he is afraid of Kampe and refuses to fight. They split up and Tyson follows Grover who goes a different direction in search of Pan. They all reunite and flee the Labyrinth after the help of Daedalus or Quintus.

The fight begins the Camp is in danger and all seems lost until Briares and Daedalus arrive, Mrs O'Leary and Quintus to help fight, once again all seems lost until Grover unleashes the cry of Panic, greatly disrupting — but not ending — the Battle.

The Last Olympian
Tyson meets with Percy when he wakes up in Poseidon's palace after the explosion of the Princess Andromeda. He seems to want to fight in the battle, and is sad because he has to work in the armory. Poseidon finally notices this and lets him lead the force of Cyclopes that helped defeat Typhon. When Tyson and a few other Cyclopes are having lunch, the armory wall explodes and a dozen cyclops are blown in. Before he can help them, they turn to silt. He grabs a club from a fallen cyclops and charges, saying an unintelligible phrase, as he has peanut butter in his mouth. It is known that he meant to say, "For Poseidon!" but the other cyclopes in the armory, because they did not understand him, used the war cry, "PEANUT BUTTER!" Poiseidon states that is a "strange battle cry". After this event, Poseidon comments that he is a good fighter, and lets him lead the force of Cyclopes that helped defeat Typhon, the Gods' greatest enemy. Rainbow the Hippocampus asks for Tyson when he comes to take Percy to camp.

On Olympus, Tyson is promoted to general of the cyclops army, and given a new club, which he calls "Stick!".

Physical description
Tyson is very tall, and very broad shouldered, and has very messy brown hair. He was one calf-brown eye, but when he isn't at Camp it is hard to notice, and it looks like he has two because of the mist. He is known for not brushing his teeth.

Tyson is also known for his strength. In The Battle of the Labyrinth he freed Briares by ripping the door of it hinges with his bare hands. Also in The Sea of Monsters he beat two bronze bulls the size of elephants, again with his bare hands.

Personality
Tyson is a very gentle and sweet Cyclops.(He's also known for crying.) He finds Annabeth and Rachel pretty, and when Percy, or Annabeth are in danger he uses his bare strength and fire-proof ability to save them because he loves them very much. He has a natural black-smithing ability, and he loves working on things. He is a softie at heart and loves peanut butter, Annabeth (Someone all known children of Poseidon seem to have affection for), and Hippocampi (or as Tyson calls them "Fish Ponies").

He and Grover don't seem to get on very well together, but he helps Grover look for Pan in The Battle of the Labyrinth.

Flaw
Tyson acts childlike, but he can figure things out very quickly (eg. when Percy tries to tell him the reason why he cannot tell anyone about Nico being the son of Hades in the Battle of the Labyrinth). He is a little clumsy and at first Percy was afraid to bring him on a quest in the Sea of Monsters because of this. He can easily become upset and cries a lot. Sometimes he forgets his own strength (eg. when he hugs Percy, who feels as if his ribs are breaking). Also, he is terrified of Grover, a satyr who is also scared of him.

Power/Abilities

 * Immensely strong.
 * Works well with metal.
 * Immune to fire.
 * Superhuman hearing and can imitate voices.
 * Gets along extremely well with hippocampi (or fish ponies, as he calls them).
 * Can survive Kampe's poison.
 * Can smell when powerful creatures, gods/goddesses or monsters are nearby.
 * Can breathe underwater because he is a son of Poseidon.
 * Can talk to Poiseidon's children mentally while in water.

Trivia

 * It is unknown who Tyson's mother's name is, only that she is a nature spirit.