Optimus Prime

Optimus Prime is a supporting character of the Guardian Squad series, general of the Guardian squad and Palutena's best friend. He's the main protagonist of the Transformers franchise.

Description
Optimus prime is an extraterrestrial robotic lifeform whose color is red and blue and blue eyes, he transforms into a 1977 Peterbilt 352 Freightliner semi truck.

Personality
Optimus Prime is as true and noble being as any the universe has ever seen. It his firm belief that freedom is the right of all sentient beings, and there is good in everyone.

Master Chief
Master chief & Optimus are two loyal partners who never leave each other, Optimus always motivates Master chief to still fighting for the people he cares.

Palutena
Optimus seem to start a relationship with Palutena, both have a wise and noble personality. Palutena always gets interested in his stories about Cybertron and Autobots.

Samus Aran
Optimus & Samus don't have a definitive relation but is known that Samus became well acquainted with Optimus Prime. She seems to respect him and she was angered when Zurg was hurting Optimus.

Zavala
Zavala & Optimus are close comrades and confided in each other frequently. They had similar goals of peace among their homelands.

Zenyatta
Both Optimus and Zenyatta are wise robots who fight for peace and justice, Zenyatta seems to respect and see Optimus as an another friend.

Trivia

 * Despite Optimus is a robot, he's not an artificiall inteligence, the Leadership Matrix allows him to have a "Soul"
 * Optimus can also transform into a plane when it's about to fly.
 * Optimus seems to have a good relationship with the Iron Giant & Zenyatta