A servant of Arachne, he is a vampiric character who has the power to transform back to how his body looked when he was younger and stronger.
Mosquito has powers similar to a vampire, in that he can heal and gains strength from sucking blood, however, he can make himself stronger by transforming into younger versions of himself.
100 Years Ago Form - His Strongest Form
100 Years Ago Form: This is his form he takes when he regresses to the age when he was strongest. His muscles grow so large he walks around on his fist.
200 Years Ago Form - His Fastest Form
200 Years Ago Form: This is his age when he was his fastest. He grows in length and takes on a form more similar to his namesake, that of a Mosquito.
400 Years Ago Form - His most powerful form
400 Years Ago Form: This is as far back as he can transform. It is his strongest form and he possesses great speed, strength, and can transform into a flock of bats. He says that he used to be made up of a series of other souls and he was once known as "Legion."