Leo, often known as Big Leo, is a Blackguard and member of Kip Guile's Blackguard squad: The Mighty. He is a Red/Sub-Red Bichrome.

Aside from being large and muscular, he is described as having shoulders like a draft horse and arms of banded iron.

Leo's parents were both circus performers; his mother an acrobat, his father a strongman. Leo inherited his father's size and strength, and from practicing with his mother, he is also very agile, especially for a man of his size. Both of his parents died in the War Of The Prisms, apparently because his father was not a skilled fighter despite his great strength. As a result of this, Leo vowed to become the best fighter he could be, so that he would never be vulnerable like his parents unfortunately were.