So I'm a little bit obsessed with Snape. He's obviously not your run of the mill 'good guy' but there's something redeeming in his love for Lily.
Disclaimer: Not my characters.
He had her eyes. A shade of green for which there was no name, brilliant and wonderful. That was the first thing he noticed, her beautiful eyes, the likes of which he had never seen on a nother soul. Until now. Until her son, whose awful glasses did nothing to hide their wonder.
He had Lily's laugh he realised as he watched the boy light up in delight at something the Weasley child said. Lily's laugh deep and rich, a full belly laugh. The kind of laugh that made people stop and laugh with her. Hearing it now left him breathless. It was like finding something you'd believed was lost to you forever. Half agonising pain, half aching joy.
Lily was lost to him save for the small pieces he found in her boy, his hands with long fingers and squared off nails, his scowl, his temper explosive and over quickly, his defence of his friends. Harry Potter wore Lily like a cloak, her spirit and her habits, her fire and her judgment. Every day he was tormented by his mistake, by his loss and he hated the boy for it.
He tried to see only Potter when he looked at Lily's boy but it was impossible. He saw Lily in everything the boy did, and it wasn't enough. He hated the boy, loathed him for being so much like her. It simply served to remind him that she wasn't there anymore. That she was lost to him forever.