A very summed up list of the RP clans that I (or an alt of mine) participate/used to participate, so you can have a clue.
Check their pages, see what you like, then mail their recruiter to see if they'll accept you in.
CORP:
https://www.warlight.net/Clans/?ID=60Despite the name, Strat/RP mix (you pick one, and expect to get tons of game invites of that kind). Forums, however, are turned to Strat, but there is a whole chat for people in the RP side.
Entering is quite complicated (moreso than most others down this list). You'll have to message any of the players labeled as "Gunjikomon" (OxTheAutist, Death, Prabster Realm, Kazuki, Tjoex or Thanatos D. Ven) and wait for them to vote if you'd be allowed in.
Wolves:
https://www.warlight.net/Clans/?ID=70Active forum base, games are quite common, only flaw is that aside from a select few that are GREAT, it has one of the worst communities overall.
They take pretty much everything despite the requisites in their profile as long as you are active. Message knyte,
AOE:
https://www.warlight.net/Clans/?ID=197Frequent tournaments and decent forum activity; roleplay sector is kind of rotting, though.
Same as the Wolves. Message j willy 47.
Juggernauts:
https://www.warlight.net/Clans/?ID=94One of the easiest communities to integrate in, decent forum activity (and unique one at that). They are good at what they do, but games are quite uncommon, sadly.
Also easy to get in, though a couple standards are placed. Ω Cat Juggernaut can be messaged, but I recommend The Russian Juggernaut (Chainsaw's Guardian Angel) because, first, Cat is on vacation, and second, Russian is more light with letting people in (my level 4 alt got in and nobody suspected a thing for several days xD)
EIC:
https://www.warlight.net/Clans/?ID=229Another mix clan. Been a while since my alt left, but their forums do have some banter and I'm aware they have games every now and then.
I don't recall how MR works in EIC, but I believe any director will be able to invite you. I'd reccomend Zenvue, for I know for a FACT he has MR.
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Honorable mention: Westeros United:
https://www.warlight.net/Clans/?ID=165Never participated myself, but admittedly it's the one place I want to put an alt in. Lots of their players are quite good at RP, and, aside from their RPCL score, they are pretty good. Fun, overall.
Similarly to EIC, I don't know how MR is distributed there; {W.U} HomeLess for sure does have Manager Rights, so he's your guy.
Edited 6/5/2016 02:19:40