The best replacement for rp is pve.

The best alternatives to rp are rated as following:
★★★★★  pve
★★★★★  hvlp
★★  normal wow
★★  pve swtor
★  pvp
★  nyp
★  rsl

Your alternative for rp is not listed? Suggest!
Speaking about rp, one probably shouldn't forget about msdp.

Other search terms related to rp and their ratings are:
★★★★★ msdp
You have in mind a companion for rp and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of rp in all years. Click on graph for more.
rp
pve
hvlp