It’s getting complex and interesting. Not sure!
HCP and N.E.R.D. are competitors of RUP, but both parties don’t really have too many major disagreements with RUP. HCP and N.E.R.D. both have members in the current government who are eager to serve. If RUP lost an election to one of these parties there’d be no question, I think, that RUP would still be given representation in the Cabinet and/or Congress.
So I’d say these three are the “establishment parties,” while Pepe, CommonSense, and whomever is advocating for dictatorship/revolution are the “opposition.”