I’ve been submitting a pet archetype for every class to Gate Pass Gazette in the hope to eventually provide unique options for everyone.
IMO, the ranger’s Beastmaster is the generalist. You can get a large variety of animals and the improvements you get just give you an overall well-rounded animal. So for the other class archetypes, I’ve been trying to make them specialists with much more limited companion options. Here’s what I’ve pitched so far, but I don’t know if most of it will get published or when:
The houndmaster, fighter, works together with a wolf to make your combat maneuvers more effective.
The bear brother, berserker, gives more of a “animals are family” feel with a bear companion. The bear itself focuses on grappling and rages when you rage.
The war falconer, marshal, uses “tiny beasts with a fly speed” (intentionally left that open so you could use a bat, but most people will use a bird) to provide unique tactical advantages not available in any other way.
For classes that don’t normally have access to maneuvers (and thus can’t get the Beast Unity combat tradition), I’ve been pushing the boundaries a little more:
The pied piper, bard, summons large swarms of rats that obey you kind of like an animal companion, but mostly they serve as battlefield hazards and control.
The gyre gazer, warlock, is gifted with a significantly empowered Pact of the Chain minion (which must be an aberration), granting it additional mind-bending powers.
I hope these get published one day, but it is my understanding that they were accepted and are being held in reserve for a period of light submissions. Given how actively this community produces entertaining content, I think that the wait will be a while!