Harry Potter
Harry Potter's velocity capabilities remain fundamentally constrained by the physics of magical transportation. Broomstick travel, his primary method of rapid movement, achieves documented speeds of approximately 150 mph on the Firebolt model, considered elite-tier equipment within the wizarding world.
Alternative transportation methods include Apparition, which permits instantaneous relocation but requires licensing, concentration, and carries significant risks of splinching. The Floo Network provides another option, though it demands fireplace infrastructure and pronunciation precision. In practical terms, Harry's mobility is impressive by human standards but remains bound by magical regulatory frameworks.
Sonic
Sonic the Hedgehog possesses a documented maximum velocity exceeding 767 mph, the established speed of sound at sea level. This capability is not equipment-dependent but rather an intrinsic biological characteristic, available on demand without cooldown periods or magical exhaustion.
The hedgehog routinely achieves supersonic velocities as a baseline operational state, with various power-ups enabling speeds that approach the speed of light in certain canonical depictions. From a pure kinematics perspective, Sonic represents one of the fastest entities in fictional media, exceeded only by characters specifically designed around velocity-based abilities.
VERDICT
The velocity differential between these competitors is not merely substantial but categorical. Sonic operates in a fundamentally different speed classification than Harry Potter, whose fastest documented travel remains below commercial aircraft velocities.
While Harry's magical transportation offers convenience and style, it cannot compete with an entity whose defining characteristic is the ability to break the sound barrier through leg movement alone. This category belongs to Sonic by a margin that renders meaningful comparison mathematically challenging.