I’m just curious if any supplement out there includes an Animal Companion that is not, in fact, an Animal. As in the type.
I mean that just any Druid of sufficient level can take; there are probably feats that allow you to get nonstandard Companions from other types, but I mean just ordinary “Animal” Companions.
Bonus points if the Animal Companion in question is an Aberration, Dragon, Elemental, Magical Beast, or Plant, and thus qualifies for Rapidstrike.
Super bonus points if you find a Construct or Undead, because that would just be weird.