For some Reason, I was about to Suggest an MMO.
Not neessesairly MMO RPG. But You know. A way to everyone to connect in the same game without Feeling too NPC-ish.
If I actually misunderstood and you make RP in a Video-game universe. Don't do Soul Calibur.
Hyrule warriors could be cool.
I'll Most likely Be SiegFried Stauffen or Nightmare or Strife From SC.
Jin Kazama is cool, only because of devil Jin, so he's not for me.
Nash(SF V era) and Evil Ryu(Alpha) from Street Fighter. Dark Link or Oni Link From The Zelda Series (Most likely Dark Link, as Oni Link is more of Majora mask's Link's Ultimate.)
Mondo Oowada, and Ishimaru Kiyondo form dangaronpa.
Yes. I have so many ideas, But I'm not sure what to choose. Q.Q