Well, you can play definitely. ^^ Anyone can, the numbers could go on and on, but not everyone can play the LBT characters, unless some people start disowning them in the rps.
I know Petrie's mom needs to be played, I'm not playing her though since I have enough characters on my plate as it is.
Or maybe you have an OC you would like to put in. Or maybe more characters can be added like these:
Hyp
Nod
Mutt
Sierra
Rinkus
Tickles
Ichy
Dil
Ozzy
Strut
Doc
etc.....
But yeah, you can definitely play Myrkin.
