Basic is the first transformation in the series as of in season 1.
In the first season, everyone is endowed their regular Basic form. This basic form usually consists of a sparkly cropped top and miniskirt or, in Emerald's case, short-shorts. However, some Basic forms consist of a sparkly dress or jumpsuit, which are clear examples of Daphne and Liana's Basic forms. Also, they usually, but not always, bear some sort of accessory on their arms such as wristbands, arm warmers or gloves. They also sometimes wear a matching hair ornament such as a tiara and their hair is occasionally tied while in this form. They also don boots or, most often, heeled shoes and sprout a pair of small, membranous, fluttering wings. It should be noted that Basic fairies cannot cover long distances and they are incapable of agile flight (see picture of the characters). It is not the strongest and most powerful form, as it only allows a fairy to use basic spells and attacks; but in a special case like fire and air fairies, they can unleash their strongest spells which happens to be intense; as seen in the final battle between Diamond and Júi in the first season. Also, Jewel and Nina are actually still on this form, even though their transformation bears the visual of Elemental Gems.
In the 4Kids version, Emerald and Cinnamon's transformation sequences has been changed and they get a redesign.