So, my campaign might come feature this adorable critter as a familiar.
I don't know how to run this bunny-robin, rules-wise.
European robins are almost thurshes, or rather, they were classified as such a while ago. Anyway, like thurshes they have a rather beautiful song. So I'm inclined to give a bunny-robin the supernatural speak ability.
D20pfsrd lists hare as a familiar on their list, but they don't link to a stat block and I don't recognize the (probably obscure) source.
There is a statblock for rabbits which I think might be a good start for the bunny-robin. The rabbit is CR 1/6, so hardly too high.
The rabbit's speed of 50 ft. is impressive, but the bunny-robin with its bird legs is probably slower - maybe 30 ft. or even lower over land? The bunny-robin also has wings, so it might be reasonable to give it a fly speed. But it doesn't look aerodynamic or anything, so its fly speed should be low. 20 ft. maybe? There isn't any rules for glide-only flight, is there? Because that could also fit.
As for the bonus granted, I might go for +4 on initiative as a hare (and many other familiars) or +3 on Diplomacy like a thrush but I happily accept any advice on the subject.
After scratching my head for a bit I realized PG on the end of that acronym for the hare was likely a players guide.
Turns out the Reign of Winter campaign introduced a half dozen optional familiars as cold weather options. You can get the book for free so its not likely going to be an issue to get it if you want to use that stat block.
Right, thanks. Found it here. Turns out the rabbit and (artic) hare has, not surprising, almost the exact same stat blocks. The hare has better stealth in snow, that's all ;)
I'm rather unfamiliar with familiars (pun definitively intended), never having played a wizard myself. What are people looking for in their familiars? I've gotten the impression that flight is a sought after quality, and I suppose supernatural speak is too. Yet the raven (and thrush and parrot) has both. So it can't be that unbalanced. Or is it compensated in the bonus these familiars grant?
Speech and the ability to hold items is highly sought-after because it allows a familiar to use wands with Use Magic Device (in addition to other, practical benefits.)
Flight is of course quite useful as well for scouting and relaying information.
Improved Familiars are almost always worth it as many of the best offer benefits well worth a feat, as well as nearly universally having speech and the ability to use items.
On the other hand, your basic familiars have access to familiar archetypes, which can be extremely useful (for instance, a Valet familiar in the service of a crafter.) My favorite, thematically, is the Figment archetype, which turns your familiar into a figment of your imagination (which rematerializes each day should it happen to die.)
The master benefits also vary drastically in power and usefulness. The Compsognathus and Scorpion familiars grant +4 to initiative, which is amazing! Others grant bonuses to saving throws, which can be very helpful if you need assistance shoring up a weak save and don't want to have to burn a feat on doing so.
Thanks for the answer, Gualthor!
Seems like flying familiars grants skill bonuses and (almost?) never grant bonuses to initiative, saves or anything else. And I suppose skill bonuses are the weakest type of familiar bonus. So a bunny-rabbit granting initiative and having the ability to fly and speak is probably a bit much.
Well, actually, if you loozed at something like the Archaeopteryx, you might have a nice baseline to build from. They grant a +2 Reflex save bonus, so you could probably make an argument for a +4 Initiative bonus (since they're both feat-equivalent benefits.)
My understanding of the Sage familiar archetype is that your Sage familiar could pick up Linguistics, and so long as it possessed the necessary anatomy to speak, it could. Since your critter is part thrush, and the thrush familiar possesses the ability to speak (and birds in general are known for their ability to mimic sounds and speech), a lenient DM might give you the go-ahead. If not, the Decoy familiar archetype certainly does the trick, though you'd have to wait a bit longer.
I mean, if you're designing your own familiar, you're going to need a pretty lenient DM anyway, but it honestly doesn't seem out-of-line.