Fridge: Weasley Girl
- Snape seems to hate "Potter's Gang" irrationally, even if Harry reminds him of how he lost Lily. "Potter's Gang" is comprised of four people: Harry, Ronnie, Neville and Hermione. The Marauders, who often bullied Snape, were four: James, Sirius, Peter and Lupin, and their leader, James, went on to marry Lily. Of course the parallels would be brought even closer for him.
- It goes further than that, since each member of Potter's Gang is similar, on a superficial level, to one of the Marauders despite two being girls (and despite Snape not looking past these traits due to his bitterness) - Harry is like James, Ronnie is rather like Sirius in being his best mate, Hermione is bookish and sensitive like Remus, and Neville is a lot like Peter (if braver within and far less likely to turn traitor as a result). Hagrid is actually alluding to this very fact when he brings up the Marauders, and how badly they interacted with Snape.
- Also, Ronnie, who spends a lot of time with Harry even if they aren't like that is a spunky but compassionate red-headed girl. Just like Lily