Kill her

What could be worse than wishing for the darkness?

You can bring the light into the dark, how will you darken the day? You can't lock yourself permanently inside four walls due to dislike towards the light.

Leon wished for the darkness feeling dizzy in the light looking at the distorting reflections.

Aarvi completed his line of 'I am..' which somewhat stabilized his confused brain, "A stinging, filthy, hideous rat." 

Probably other than her, nobody finds him ugly. For her, nobody is uglier in the world than him. It might be looks or his personality, in fact, everything about him is a stinking nasty sight for her.

Leon saw Ava Kelly walking from left to right at a few distances before standing still. He doubted she might be a reflection but his eyes soon caught the reflection of her back on the mirror which was behind her.