Lark is able to manipulate his own blood on a cellular level controlling its properties from density and length to even temperature, speed, and rate of coagulation. The quirk requires he often create incisions on his skin and as a result, he is scarred and usually looks pale and emaciated due to blood loss. His tolerance of the pain associated with using his quirk is a learned skill. He is also able to sense the blood of others within a 50m radius distinctly telling different blood signatures apart. This is especially handy for reconnaissance and tracking, when necessary. 2. Red, Bloodshot eyes