I'm going to place my interest here. I'll have both master and servant. I am also not really one for mastering my own servant.
That said [@Grey], I wouldn't mind you commanding my servant. I have an idea for Assassin (Kawakami Gensai), Lancer (Leonidas I) or Caster (Xuanzang Sanzhang).
As for PvP, I am neutral about it. I mean, yeah, it might create conflict between roleplayers, but if we use a dice option (if there is any), it is randomised.