1)So far I've seen pics of the following G1 characters: Optimus, Megatron, Ultra Magnus, Starscream, and Hot Rod. Are there others?
That's it for G1 characters. There are a few more based on the recent Movies. Optimus Prime, Bumblebee, and Jetwing Optimus Prime.
2)Besides Ebay, are there recommended places to buy them? Also, if these are Asian toys, are
there lots of bootlegs out there to watch out for?
They are Japanese. The Company is called Kaiyodo. They have several different licenses for their Revoltech figures. Transformers is among them. Though the G1 figures were quite shorted lived. As far as knockoffs of these: I'm not aware of any.
3)Are there other companies/toylines out there that you'd recommend over these Revoltech figs?
Don't know of any others that make poseable figures like these. Even less so that would have the Transformers License.
4)I'm really a big fan of TF: Prime and TF: Animated. Are there any Asian companies that made/make figures from these shows that are like the Revoltechs (ie: Non-Transformable, poseable figures)? I really like the character designs from these two shows and just want show accurate toys of the character for display in their robotic form...not interested in putting them in vehicle mode.
Don't know of any. As evidenced by the shortness of the Revoltech series, it seems that non transforming poseable versions of Transformers aren't really that sought after to warrant continuous releases.
Takara did release a few Movie based non-transformable poseable figures under the Dual Model Kit banner. But that's as far as it went.