There are pixies in forests, fountains, flower beds, and everywhere else. If you can't see them, it's because your heart is impure. Look, there's one right next to you!
Trickery, moodiness, mischief... While these are all aspects of the pixie's character, the most important factor is the strength of their feelings. Indeed, they are the most emotional species of all, and will sacrifice their lives to help their friends and families.