I suppose I could step in for when you're doing your Auditions Sinead.
As for characters to play, I'm less inclined to play Canon characters and more inclined to play my OC's.
The trouble we have though if we throw in too many OC's is that we may dilute the original Beast Wars down to almost nothing. We're going to need a bit of a story as to why so many new characters have been throw in all of a sudden, especially if we're all going to avoid the "A new character emerges from the convenient plot device, err, stasis pod" syndrome.
My Idea:
RP with just a few OC's thrown into the Beast Wars at first. Have the remainder of our OC's on Cybertron and dispatch them to Earth at a later time to Rescue the Axalon (we could alter the events of "The Probe" to make it fit, or we could have them dispatched as part of the probe fleet).
Our Predacon OC's could stowaway on such a vessel and just as it reaches Earth, come out of hiding and try to hijack the ship
After the inevitable crash landing our OC's could then join the Maximal or Predacon cause, or perhaps form their own, not necessarily allied coalition to mix things up a bit.
I'm not saying of course that we cant introduce OC's via the stasis pod method, but if we're going to have a lot, this idea at least averts that particular Cliche.