Yes. List of characters would be good. I want you to play mainly LBT characters that we know from movies and series. OC characters will be allowed, but if you want them to interact with the gang (or any other LBT individual) in "episode" plot more than being a background dino, then you will have to just remember about one thing. What is this thing? Let my show you an example. If in the first season (or the movies) Littlefoot has never met a girl longneck called Plo, then a player leading this character cannot write that she knew Littlefoot since hathing and they are in love with each other. Do you see what I mean?
When your "actors" are playing their role in episode, then just dont write anything that is contradictory with anything that happened before in LBT. Outside of the second season plot (which begins immiedietly after last episode of season one), or in other words behind the scenes, your "actor" can behave as you see fit.
So... Long explenation short: you can play as any LBT character that showed in the movies or series (and is still alive), some humans that are the filming staff (there wont be too many of them) and oc characters.
And we will start when enough people will choose their characters to play, Neogen.
If you have more questions, then, please, dont hasitate to ask them.

Pessimist sees a dark tunnel. Optimist sees a light in the tunnel. Realist sees the light of coming train. And a driver sees three idiots standing on the track.
"My heart has joined the thousand, for my friend stopped running today." - Watership Down by Richard Adams.