On the Hogwarts Express Lily notices him. A scrawny looking boy, obviously also a first year. He has black shaggy hair, glasses, and warm, friendly brown eyes. The main thing she notices about him is the way he keeps watching her. He thinks he's being subtle, pretending to read his magazine. But his eyes aren't moving across the page. That, and it's upside down. She mostly ignores him and continues reading History of Goblin Warfare, their History of Magic textbook. Well, she tries to ignore him. When the staring begins to unnerve her, she joins in Alice and Sasha's conversation.
By the end of the train ride James Potter (it was written on his shoe) has freaked her out.