The Red Knight is a minor character from the 1985 animated series She-Ra: Princess of Power.
She-Ra: Princess of Power
The Red Knight was a mysterious warrior clad in crimson armor. He vowed never to take off his mask or tell anyone his true identity, until the day that Etheria was once more free from the grasp of the Evil Horde.
The Knight rode a white horse whose name remains unrevealed. Queen Angella found the voice of the Red Knight very familiar, but couldn't put her finger on exactly where she recognized it from.
Afterwards, he joined his new friends at the Rebel's Fair in Blackmoor and won the "Rebels Run" contest, in which he competed against Bow, Frod, Gommoroth and Kristan. This made Bow, who had won in previous years, feel embarrassed and inadequate. However, when Hordak and his henchmen attacked Queen Angella, whose power was greatly diminished as she was away from Castle Bright Moon, she, Glimmer and the Red Knight were captured by Hordak's latest device, the Laser Bubble Blaster. Bow managed to redeem himself and regain his self-esteem by saving the three of them.
Afterwards, the Red Knight called Bow "a true hero" and asked him to teach him to shoot a bow and arrow as well as Bow. But Bow refused, assuming that the Red Knight would probably beat him at that as well if he taught him.