Sonic the Hedgehog

Sonic is a strange mutant creature that lives in Zobooland. Due to its nature and time of hunting being at night, not much is known about Sonic's appearance, although a Sensit who made it to Robotnik's base said that he appeared to be a sickly greyish blue with dark red appendages going in a blurry circle. Said Sensit also described Sonic as incredibly spindly, almost unnervingly so. It also apparently did not "run" using conventional methods, instead seeming to float. Robotnik then took care of the Sensit, and he was released a few days later, though had to "Take it easy." Sonic's hunting partner is Tails.

Behavior
Sonic will only hunt at night, but more importantly, he can move silently, and quickly. He can move so fast, in fact, that those who see him as a spindly blur, and may believe they are having hallucinations. Sonic plays with its victims this way, causing them as much fear and trauma as possible; he may, indeed, feed off of fear-related pheromones rather than physical food. He then begins to quickly strike the Sensit with rocks, splintered wood or a bizarre, extendable black feeding tube on his face. Sometimes, once the Sensit is weakened, Tails will quickly ambush the Sensit and stab it with its two sharp appendages or quickly fly up and drop it from a massive height, breaking its spine.

Victims
Following a Sensit and driving it insane, then performing the aforementioned method of hunting (Applies to multiple victims.)

Driving a Sensit insane, causing it to run around maniacally, then rotating it by running around at ridiculous speeds, eventually causing it to run off a cliff and land on the spiky rocks at the bottom.

Following Robotnik, which he ignored. During the attack, Robotnik quickly snapped a picture, and ran back to his base, he was lucky to have acquired his strange regeneration by then.