That's right a Snape with the Marauders Map??? How can that be? Well easy when you have a bit of trickery in you.

Misters Moony, Padfoot, Wormtail and Prongs. Known to me as Professor, Best Friend, Idiot and Him, respectfully, or just the pranksters and bullies. Who can say. They needed a map, they created a map but I didn’t need one. I already had all the information at my fingertips. Before I even started at Hogwarts, I had discovered Filches office and all the things that he had confiscated from people over the years. The map was quite a find. What it allowed me to do more than anything else was to see where people were at any given time. I didn’t have it for long.

Fred and George were the main owners of the map during my time at Hogwarts and in my fourth year, I believe Harry Potter used it to do many things, such as get into Hogsmeade. Being equipped with an invisibility cloak he found it easier but myself and indeed Peter Pettigrew were transfiguring into small animals to go to different places at the time. I was also one of the few that was allowed access as neither Sirius Black nor the Dementors were able to cause any harm to me.

I have been asked how I appear on the map. So far, I can only go on what I have been told by people when I was ten to fourteen years old. Most have told me they see me as Louisa Snape, as that is the name I go by. However, when I look at the map, I have seen Sarah Louisa Snape-Riddle, Louisa Snape-Riddle and HRH Eléa Prince. It seems to me that not only could a person display the name that they are known by but also names that their friends call them or official titles. Meaning that titles such as Moony, Wormtail, Padfoot and Prongs could have been on the map.