I don't see many Dream SMP RPs, nor do I see many MineCraft RPs on this site. That doesn't mean people don't want MineCraft or DSMP RP, but it is likely their cravings are based more in another fandom. Pokémon is incredibly popular here, as well as anything Nintendo really.
People are accepted based on their character sheets and future actions in the discussion and roleplay, not who they are as a person. People won't really care about what you like (not saying it in a mean way, just saying that there won't be much for them to go on unless they are great at holding a conversation or know who you are talking about).
Normally, RPs will have a discussion thread where they will have the plot laid out, rules for that RP along with the rules you have to follow on the site, and then a template for character creation and their character. You submit a character sheet with the template they give you to make sure your character isn't OP or doing anything against the rules. Which, I'll link here shortly.
For Global Rules, which talks about common courtesy and site behavior in the forums and threads, go here:
https://pokecharms.com/threads/the-pokecharms-global-rules.99/
For the RP rules specific to the Pokémon fandom, go here:
https://pokecharms.com/threads/pokemon-role-play-rules.9451/
For the RP rules for any other non-Pokemon related fandom, go here:
https://pokecharms.com/threads/general-role-play-rules.123/
This community is generally pretty accepting no matter who or what you are. So, don't worry too much about all that.