I been what a dragonling companion as expansion here are my ideal

level basic progress with trust system every time you battle with the dragonling you build a trust for inexprence partner to trusted allied

you have access to the different spec with dragonling

healing

dps

tank tree

each tree has dragonling take on different color basic on his roles

the system would basic trust. the high this the more exp you can gain for little fellow can be. I not sure this would include armor for the dragonling I not sure the dragonling would find the enjoyable

through dragonling barding might be kind cute