A boy whom Fate takes in and cares for, and the guard wing of the Lightning Squad. He uses an armed device named Strada. It is a spear (electricity attribute), similar to Signum's sword (flare attribute). He uses the modern-Belka magic system, but is also able to perform some Mid-Childa mobile magics like Sonic Move. Erio was adopted by Lindy Harlaown four years prior to StrikerS, as Fate was legally too young to do so. Erio shows signs of a romantic interest in Caro.