Rotor is a large Mobian walrus with purple and tan-yellow fur, green eyes, and large tusks. He wears red gear and has black gloves.

Rotor is very calm and friendly and likes peace and stability. In the past, he wanted to be a superhero like Sonic, but after he got a taste of such a life, he decided that it would be best for him to stick to what he is best at: being a handyman. As an inventor, he is very devoted to his mechanical creations. He enjoys it when they work well, but he can also worry and even get angry when they do not meet his expectations.

Rotor can occasionally be bashful, particularly when talking to girls.