L has very poor social skills, and is prone to performing actions or having habits considered rude and inappropriate, including eating with his mouth open, talking with his mouth full, placing feet on furniture, biting fingernails, etc. L is a very slim, pale, tall young man with black hair and dark eyes. One of his most noticeable features is the shadow below each of his eyes, a result of sleep deprivation. L is always shown to be wearing blue jean pants and a long-sleeved, white shirt.