Lenalee

She's a nurse who lost her eyesight after getting into an accident, and after attempting to perform surgery on herself, ends up blinding herself completely. She uses the eyes around her to see, but in exchange the rest of her senses are drastically weak. So she rarely talks and mostly keeps to herself.

She also tends to get sick when she uses them too much since each eye looks in a different direction, and she gets dizzy and starts to panic. When the eyes are taken down, the rest of her senses are strengthened to compensate for the lack of sight.

Some say that an unknown eldritch entity blessed her with the eyes out of pity. However, nobody knows what its true intentions are and if it's really out of pity, or malice.