Scorpio is a Celestial Spirit that is one of the 12 Golden Zodiac Keys. His key is currently owned by Lucy. He is also Aquarius's boyfriend with which he has a happy relationship. His weapon appears to be a large, strange gun shaped like a scorpion's tail.

Scorpio has a strange manner of speaking which is similar to the third person where as he says "We are" in the beginning of each sentence. Scorpio has also a habit of folding his middle and ring fingers back while keeping his index and little fingers extended, mimicking the pincer claws of a scorpion.

Unlike Aquarius, Scorpio hasn't shown any hostility or dislike towards Lucy. In fact he seems to genuinely respect and care for Lucy.