Popmundo

IMO, one of the best (if not THE BEST), online RPG. Considered a musical RPG, but not to me, because there's way to much you can do.

Have Kids
Get Married
Own companies
Record Labels
Political System
Going to Prison
And much much much much much much more.

You can even get addictions to alcohal/drugs and buy houses and shits. HIIIIIGHLY UNDERATED. Only flaw, it is big and confusing at first, and you NEED V.I.P. Without V.I.P, you don't get kids, marriage, and a lot of other stuff. Try it out.