I think there used to be or is a "3rd party" site that helps you pick a minion for your pet based on color or species...

but is there one that helps you pick treasure chest items?

As far as I'm aware, there isnt really such a resource. I believe it is SubetaLodge that has the minion picker.

I've seen people post on the Pet forum to ask for TC help though, you could try there and see if there are helpful users :) https://subeta.net/forums.php

Oh bummer. Yeah I might could try there.

I think I probably should decide who all my pet are first, maybe that will help...