Usually seen decked out in the colors of their favorite house(scarves, fake glasses, fake scars,'magic wands',robes, etc) casting imaginary spells at one another.
Tend to associate with houses based on their morals, and what each house represents. Color is often another major choosing point.
Can be found in front of movie theaters for midnight releases of Harry Potter movies, or at J.K. Rowling book signings. Also at other alternative social activities, such as anime/comic/harry potter conventions, book stores, and family basements.
A potty can be either male or female, and are often single, but do tend to inter-date one another. Incredibly socially awkward, and often introverted. Their preferred non-potty crowd is interspersed with other socially awkward folk,(D&D/Yu-gi-oh/pokemon/WoW players, anime fans, comic book folk, goths, etc.) with whom they will also pursue relations.
Person 1: Wanna go to the movies tonight?
Person 2: No, the new Harry Potter flick just came out. The
theater is gonna be Potty heaven. Maybe next week.
Person 1: Did you see <insert name> today all decked out in Gryffindor crap. Doesn't he/she realize that Harry Potter is fake? What a potty.