Miles Prower, known as Tails, hails from an unnamed world in a parallel dimension to Earth. A unique genetic mutation granted him two distinct tails, leading to significant social alienation and bullying in his youth. This isolation ended when Sonic the Hedgehog discovered Tails interacting with his biplane, the Tornado. Tails had modified the aircraft, painting it blue and enhancing its performance. Sonic's acceptance and encouragement helped Tails reframe his perceived abnormality as a strength, fostering deep admiration and loyalty. Their bond solidified into a brotherly relationship, with Sonic becoming Tails' primary role model.

Tails wields exceptional technical aptitude and ingenuity, specializing in mechanical engineering and invention. He designs, constructs, and modifies advanced machinery and electronic devices. Notable creations include specialized aircraft developed collaboratively with the human inventor Chuck Thorndyke, such as the significantly more advanced X-Tornado. This jet-plane features capabilities tailored for aerial combat and mission support. Tails pilots these aircraft himself during operations.

His twin tails grant unique physical abilities. Spinning them rapidly like helicopter rotors, he powers into flight or sustains hovering. This aerial mobility allows him to navigate complex environments, evade threats, transport allies over short distances, and position himself strategically during conflicts. While flight is his most recognized trait, his tails also enhance swimming proficiency and provide bursts of speed during ground movement.

Beyond Sonic, Tails forges strong bonds within his social circle, befriending Knuckles the Echidna, Amy Rose, Cream the Rabbit, and Cheese the Chao, forming a core group that counters threats. His relationship with Chuck Thorndyke is particularly significant, characterized by mutual respect and a shared passion for invention. Chuck provides mentorship and resources, facilitating the development and refinement of Tails' technological projects.

Tails primarily supports Sonic during confrontations with Doctor Eggman, utilizing intellect, gadgets, and piloting skills rather than direct combat. He provides strategic analysis, deploys electronic countermeasures, and engages enemy robots from the air using the X-Tornado. His interventions often disrupt Eggman's plans or create opportunities for Sonic. During one significant operation, he assisted Sonic in thwarting Eggman's scheme involving the capture of Little Planet, where his technical expertise proved vital against robotic adversaries and environmental challenges.

His personality blends innate kindness, curiosity, and humility with increasing confidence and courage fostered alongside Sonic. Initially reserved due to past bullying, his loyalty to friends motivates him to confront danger directly when necessary. He strives for self-reliance and personal growth, seeking to contribute meaningfully to the team's objectives beyond technical support. This drive fuels his dedication to improving inventions and tactical decision-making during operations.