I think we should have pets to follow us around, they wouldn't do anything they would just be cosmetic. If bungie wanted them to do something,They could do things like
-Fetch us ammo
-or eat ammo and poop it out for us(lol)
-Tricks (depending on what type they are)
-They could have their own little emotes you can activate
Here are some animal ideas
-dog
-cat
-Tiny dreg
-parrot
-A mini minotaur
-a rc car
-airplane
-little zombie
-A smaller version of your own ship
Also they would all have their own quest to unlock the pet for example to get a mini ship you would have to get a quest form Amanda holiday or to get a cat or a dog You have to forge a treat, silly right? or would you rather get a cat or a dog through a error code?
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Or just make our ghost more useful