Never do a quest if they ask for something extremely expensive. Trust me, it isn't worth it.
Fire Uber-Faerie
The Fire Faerie will ask you for clothing items. For completion of her quest, she will give you an increase of your pets strengh by one - three points. Her quests are worth doing.
Light Uber-Faerie
The Light Faerie will ask you for specific trading cards. For completion of her quest, she will give you an increase of your pets level by one - three points. Her quests are worth doing.
Earth Uber-Faerie
The Earth Faerie will ask you for certain magic items. For completion of her quest, she will fill your pet/s up with food and/or restore lost hit points. Her quests are not worth doing because you put in alot more than you get back from her. Her quests are just too expensive.
Air Uber-Faerie
The Air Faerie will ask you for random beauty products, most of them not being too expensive. For completion of her quest, she will give you an increase of your pets movement by one - three points. Her quests are worth doing.
Dark Uber-Faerie
The Dark Faerie will ask you for random toys. For completion of her quest, she will give you an increas of your pets hit points by one - three points. Her quests are well worth doing.
Water Uber-Faerie
The Water Faerie will ask you for different books. For completion of her quest, she will give you an increase of your pets defense by one - three points. Getting your stats raised is good if you like to battle but books are kind of expensive right now. So I say make your own judgement on this one.
Faerie Queen
The Faerie Queen will ask you for all different types of items. For completion of her quest, she will give you an increase of all your pets stats. Her quests are generally expensive most of the time but if you can afford it, her quests are well worth doing.
Space Faerie
The Space Faerie will ask you for just about any item. But her quests are definately worth doing. For completion of her quest, she will give you an increase of one of your pets levels by four points. So if you can afford the item she asks you for, I would definately do the quest.