Well, we have fanfiction, and OCs. But what if we wanted to change the canon characters? Some pages, like Chomper(VV) have already done something like this, but now, with this new format, we can expand upon it just like an OC, only with a canon character.
Now you can have greedy Littlefoots, gentle Ceras, murderous Chompers, lying Rubys, biased Grandpa Longnecks, evil Duckys, brave Petries, married (again) Brons, living Mama Longnecks, gossiping Alis, and talking Spikes in here.