A knight who has sworn loyalty to the country of Winner. He was once a demon god of Winner, but through the guidance of the Golden God, he was reborn as a knight of the Gundam tribe and destined to protect his country. When his country was attacked, he lost his will to fight, believing that his country had been lost due to his own lack of strength. However, when he realized that there were people to whom he swore loyalty, his fighting spirit was rekindled. For the sake of the Union Clan, he stands up to Genesis Army OZ World, alongside the subjects of Winner.

Sandrock was destined to protect the land of Winner, but he went out to rescue King Quatre from monster attack. However, he regrets that the country was destroyed by an enemy attack that took advantage of his opportunity.

His special move, "Hot Bow Scissor Cherry," fires a flaming arrow that leaves a trail of heat haze and pierces the desert. Furthermore, his "Serpent Scissors," which attaches a blade to the front, becomes a scorching-hot fang that scorches the air.

The soul of Knight Alex awakened within Knight Quatre, bestowing his divine protection upon Sandrock, giving him immense leadership skills. Under Sandrock's command, the morale of the Union Army also rose.