Killua has spiky silver hair, very pale skin and blue eyes. His eyes change shape depending on the mood that he's in, narrowing and sharpening when he goes into assassin mode. Killua is fairly lean at the start of the series, due to constant physical conditioning and torture training he received when he was young. As time passes, he becomes more muscular and toned. In the Nippon Animation anime adaptation, Killua's eye color is changed to green during the OVAs. He is also often seen holding a green skateboard (turned yellow in the 2011 series). Killua typically wears baggy clothing, with his usual attire consisting of long-sleeved and dark-colored shirts.
The most common cause of cauliflower ear is a hit to the ear -- or repeated hits to the ear -- that leads to hematomas, or small collections of blood that clot and block the flow of blood and nutrients.
There are several known tinnitus causes. The most common cause of tinnitus is exposure to loud noise. High-volume sounds such as gunshots, loud music or heavy machinery can cause permanent damage to the cochlea hair cells, resulting in ringing in the ears.