Dr. Thomas Light is a robotics scientist and inventor featured in the anime. He created the robots Mega Man, Roll, Proto Man, Rush, Eddie, and Beat. His laboratory houses advanced technology, including a time machine stolen by Dr. Wily. After this theft, Light developed alternative devices such as a time warp boogie board and space-travel equipment for Rush. He also constructed specialized tools like a metal paper fan designed to eliminate typhoons.

He consistently displays optimism and maintains a calm demeanor when facing technological setbacks or villainous interference. His scientific expertise allows him to improvise solutions using available resources, such as assembling functional devices from salvaged mechanical parts during emergencies. His inventions sometimes facilitate cultural education, indirectly exposing robotic characters to human traditions during missions in Tokyo.

Physically, he is depicted with a shorter stature relative to other characters, consistent with the anime's style. He wears a laboratory coat and shows paternal concern for his robotic creations, overseeing their maintenance and functionality. His role primarily involves providing technological support rather than direct combat participation.