There just seemed to be beast modes that made for pretty good beast modes and that's why they kind of gravitated towards repeating those.
And I think there are some UNLIKELY beast modes that they purposely steered away from. Now, I know some of them were toys, but when you think about it in the sense of using them for the show, they would have been difficult for the animators to animate or were just too ridiculous to even fathom for a character! Some beast forms would have just simply been awkward or uninteresting as characters or difficult to relate to. So I'm talking in terms of the confines of the show and not in terms of RPing or the toy line or even the comic books.
So here are some that I was thinking of.....
Fish
Naked Mole Rat
Bacteria

Ladybug (since the insects were generally Predacons, I don't imagine a lady bug would have made for an entertaining or threatening Pred)
Chihuahua or any annoying yappy dog
Snail
Giraffe
Okay, so what unlikely beast modes can you come up with???
