Jax Amboy

Jax Amboy is a protagonist in the Five Worlds comic series. He wears a golden Starball uniform, sometimes a plain shirt and pants over it, and has brown skin and blue hair.

WARNING: Major plot/spoiler details ahead.

The Sand Warrior
Jax is a famous Starball player who is performing on Beacon Day. During the attack at Starball Stadium his arm is crushed beneath the rubble. Oddly, multiple times his reactions are unusually delayed, including his reaction to losing his arm. He follows Oona and An Tzu through the rubble and they eventually arrive at his Uncle's house, where it is revealed that he is actually an android and he gets a new arm. Later he helps Oona get the White Beacon where she can light it.

Also, at his uncle's house, Jax's new arm shows the order in which the beacons are supposed to be lit, and can shoot energy beams.

The Cobalt Prince
Jax "sacrifices" himself to stop rouge Toki ships from attacking Oona and was believed dead by Oona and An Tzu, having crashed onto Salassandra on board the Toki ship. At the end of the book, he returns, and, as Oona and An Tzu note, he "seems different."

The Red Maze
Jax tells the story of what happened to him. After sacrificing himself on Salassandra, he was dying. He met a group of mysterious creatures called the Devoti, and bonded with one of them. He discovered that the Beacons have to be lit in a different order (via his hand) before returning to Oona and An Tzu.

Jax rejoins Starball and confesses to his team mates that he used to be an android (now that he is bonded with the Devoti, he has human emotions). The leader of his Starball team plans to reprogram him, and eventually does so successfully. But An Tzu manages to reawaken Eske (the Devoti he bonded with), overriding the reprogramming. Jax goes with Oona and An Tzu after this.

The Amber Anthem
Jax is trying to convince people to help him, Oona, and An Tzu light the Yellow Beacon. Suddenly, Oona is attacked by a evil android that looks just like Jax (it is the only survivor of the Jax army that was built and destroyed, unbeknownst to Jax, in the Red Maze) and Jax must fight it off. Later in the book he sings the Amber Anthem in the place of the Devoti.

Oona
Oona is angry at Jax in the Sand Warrior, because he was playing Starball on Beacon Day. She eventually warms up to him and now they are close friends.

An Tzu
An Tzu was Jax's #1 Starball fan until he found out he was a robot. After that An Tzu would often call him "Bot Boy" and was angry at him, feeling lied to. But he also warms up to Jax.

Trivia

 * Jax does not have pupils (eyeballs) in the Sand Warrior, but when he bonds with Devoti, he gets them. When he is reprogramed in the Red Maze, his pupils disappear again, and he does not get them back until An Tzu reawakens Eske.
 * The reason Jax's reactions are delayed in the Sand Warrior is because he doesn't actually have emotions and cannot feel pain as a robot. In the Red Maze, he describes what it feels like to suddenly have emotions.