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.
Loud noises cause hearing loss by damaging the stereocilia: tiny hairs that sit on the top of hair cells in the inner ear. Noise makes them vibrate â changing the voltage in the hair cells â which then sends chemical messages through nerves to the brain. Battering your stereocilia will damage your hearing.