User blog comment:J1coupe/Parappa the Rapper vs. Chorus Men. Epic Rap Battles of Video Games Season 7./@comment-24083265-20150629233827/@comment-25263388-20150630183038

When you get certain achievements, they can do things. You can turn one into a fully equipped Spartan (Halo style), or a ringleader (a la Barker of Carnival Games) or other stuff from games I haven't actually unlocked anything other than that but KK.