General Explination: OVAs are generally released for home video (be that VHS, DVD, or whatever), whereas it's possible for a Special to be released as a television broadcast that is just separate from the rest of the show.
OVAs are often shorter than a normal episode of the show, while Specials are often as long or longer, although this definitely doesn't always hold.
Some OVAs are not associated with a show, so they aren't a "special episode" of anything. For example, the series Video Girl Ai was only ever released as a 6 episode straight-to-video OVA.

So How Does This Relate to RP?: Simple. The ova set of RPs are going to be similar to that of anime. Basically these RPs be better viewed as independent RPs. While it does retain canon material of the roleplay such as being friends with certain people and knowing certain RPCs, the story and theme of the RP will continuously change to different types of RPs. This will be signified by episodes. For example, episode one is Beach episode, so the RP will take place at the beach. You pretty much have free reign do whatever you want. Chill, sleep. Or even have a giant tentacle monster attack. Choice is yours. No posting order. Just post. Enjoy. Everything here doesn't have to follow canon. Tired of being with your rpc girlfriend >_.> <_< GO HOOK UP WITH ANOTHER RPC. but just know. You didn't heat it from Teddy. you heard?

Rules: Just literally. Don't be a d**k. That's all. If your RPC is a d**k that's fine. He can be a d**k. So what do Teddy means when he says don't be a d**k. I mean. No intense GodModding/ Trying to destroy or kill someone's character automatically. (Now you got beef with an rpc and you trying to square up. That's fine but no going. "And Jack Kills Rain, crushing her skull completely in which he moved so fast she had no way of blocking or dodging the attack. LOL. Make a new RPC !" Besides that. You are good. Have fun. Make some good entertainment.