Just research diff. types of Fairies.
There are Dark Fey, Light Fey, Water,Air,Earth, etc. etc. There are fey for everything. Look on google, wikipedia, everywhere. You can look in groups if you want too. They have some useful info on there.
Faeries are found in every part of the world from Ireland to New Zealand and in each place they have different characteristics but are basically the same species and are very similar to humans in size and appearance. They can live in different environments e.g. water, underground and that has an effect on their behaviour. They have the power of glamour and with that they can make them selves appear as they wish. So there is just one Faerie specie which has many types.
Go to http://www.sacred-texts.com/ and do a search you will discover much.