in 3.5 I took a ape totem, 5 levels of druid and a prestige that gave me an animal companion boost, as well as more than one animal companion, at the sacrifice of the prestige not giving me spell levels.
And I was fine with that!
I would like to make another such build where my character's power resides in my animal companion(s) and what little druid spellpower I can must I use to buff it, ideally through a feat to make 30 foot share spell so I don't have to be near it ( not sure that exists in pathfinder ).
By powerful I mean most druid level to increase the animal companion table position. Adding character feats to amplify the animal companion, as well as the animal companion feats contribute to the said power.