The type of character I'm playing as would really look cool with a bird pet that comes to him/her and sits on the shoulder or arm during an idle animation. Perhaps a small variety of birds to choose from so as to not have every single player sporting the same winged creature.
The Bat would be a nice somewhat cliche vanity pet for the vampire player that feels incomplete. ZoS, please consider adding these. This is something I believe that players would love and would add yet another variety of pet to the game!!