A fairy godparent is usually around the same height of a human child. Fairies are defined as "free spirited", and "colorful". There is, however, a distinction between a fairy and a fairy godparent. Fairies are able to roam free in fairy world, living as they please. By going to the Fairy Academy, a fairy can become a fairy godparent and get assigned to a godchild. Fairy Godparents are mainly property used to make a miserable child happy again, but they must be treated with respect or love, as it is shown that if pushed too far, both a fairy and its godchild can give up posetion of the other.
Fairy Godparents have more power in reality warping than Fairies, and are trained in happy wishmaking, as shown in This Is Your Wish.
The fairy Godparents are led, trained, and assigned by Jorgen Von Strangle. Until that point, Fairy Godparents are to engage in certain activites assigned by Jorgen and are his property until assigned. Fairies must obide by a large rule book called Da Rules. They are, in fact, unable to go against the rules even if they wan't (or mean) to, as any attempt will be covered by a rasberry-like noise, the shine going dark, and the wand falling like rubber.
In most uses Fairy Godparents give their godchild any wish that doesn't break the rules. Some Fairy Godparents are nice and kind, while some are rough and mean. They take on duisguises in public, usually a pet at home. The revealation of a fairy will result in confescation by Jorgen and the godchild's mind being erased.
Fairy Godparents are usually assigned to a kid with parents that are similar to their personality, in a way of a foil. For example, Timmy's parents are rather wild and foolish in personallity, as well as very neglectful, So his godparents are the same, only they pay extra attention to Timmy, unlike his neglectul parents. Remy's parents are very self adsorbed and narcissistic, and pay more attention to money and social appearence than their son, so his godparent is similar, only he is in love with his looks, rather than his money, and sticks to Remy all the time.