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An artifact implanted and given to him by a mysterious entity at the cost of his sister's sight. He has heightened visual senses, allowing him to see fast movements normally impossible for human eyes to follow, or minute details with great clarity. The eyes are also equipped with a self-restoration function such that over time, they will heal themselves of any damage sustained.

Most importantly, his eyes are able to see 'The Truth' of the world. This allows him to see past world altering illusions along with perceiving an individual's unique aura. His eyes are especially effective in identifying the scarlet feathered aura of a Blood Breed. Upon staring at an Elder Blood Breed for a duration, he is able to see their "true name", but only if its heart is present. Leo can also manipulate the vision of others, including that of machinery such as Aligura's monster truck, and force them to move in the direction he wants them to, or see through another individual's eyes and even witness past events that they have seen.

Using the power of his eyes however has its limits, as they overheat upon prolonged use of their abilities.
 * Plain Eyeballs (平眼球 Hira gankyū?): Leo induces nauseating hallucinations on his opponents. In the manga, this technique is unnamed and Leo simply commands his opponents' eyes to obey him.
 * Vision Transmission (視野転送 Shiya tensō?): Leo projects what he sees into the minds of others, effectively sharing his sight with them.
 * Vision Shuffle (視野混交 (シャッフル) Shiya konkō (Shaffuru)?): Leo alters the vision of those around him by shuffling their field of visions.