I hope the pets implementation is, well, fully implemented very soon. It is an awesome idea. We could have pet battles potentially, or just have a partner to follow you around.
Anyway, a good idea for pets would be:
Have random creatures (some better then others) roam around yliakum. If a player stumbles across one, they can take it for themselves as a pet. Then, depending on how rare that pet is, another one will respawn there in 5min to a day, to maybe even a couple days for super rare and good pets. Pets of course would be able to level up and get stronger.
Ideas for pets:
Lizards, tiger type creatures, lygers (rare), wraiths (rare), eagle, hawk, phoenix (rare), etc.
Also, there should be a rabbit of some sort, even if they can\'t attack, it would be fun haveing a cute little rabbit follow you around