The pilot of Tobot X. Now in 5th grade, he remains a model student. He values logic and is quite knowledgeable for his age. He is deeply interested in the Tobot system developed by his father, Franklin. While he is a responsible and rational boy who stays calm compared to his twin Kory, he can sometimes come across as condescending when explaining things he knows.

Ryan's twin and the pilot of Tobot Y, also in 5th grade. He still hates studying and loves causing trouble, but has grown a bit more pretentious since starting 5th grade. He bridges the gap between his excessive boasting and lack of effort with his slick attitude and silver tongue. Though he often acts shamelessly—such as showing interest in other Tobots in front of Y—he is actually a very warm-hearted and sincere person deep down.

The pilot of Tobot Z. Although in the same grade, he is slightly taller than Ryan and Kory, giving him a more mature appearance. His left arm and left leg are robotic. He is a boy of few words and doesn't express himself much, but he is thoughtful and possesses a subtle sensitivity, caring deeply for his family and friends.

The son of the chairman of the Clover Group conglomerate. Due to his extreme shyness, he is often misunderstood and struggles to make friends. He successfully activated a Mind Core he bought with his saved allowance. With the help of the Tobot headquarters, he becomes the pilot of Tobot A.

Nathan's younger brother. He once spent a long time in the hospital due to poor health, but he has since recovered. A massive fan of Tobots, he is very proud that his brother is the pilot of Tobot W. He is a natural strategist with a remarkable talent for persuading others.

He once lived apart from his parents due to family circumstances, taking care of his sick brother while serving as the pilot of Tobot W in Daedo City. He now lives happily with his parents on Gaje Island. He is a computer genius.

The pilot of Tobot Steel, Chrome, Iron, and Heavy Metal. A 4th-grade girl and the granddaughter of Dr. Ma Gak-jin. She is outgoing, makes friends easily, and is a self-driven woman of action. However, her excessive enthusiasm sometimes causes her to get ahead of herself.

A curious 3rd-grade boy living in the house across the street. His innocent personality makes him the energy source of the Tobot crew. Initially, he was dark and wary of strangers due to family issues and a leg injury, but he opened his heart and regained his bright personality through his interactions with Tobot Z.