Waterfall is from a unnamed planet. all creatures there have the tail she has.  
She was actually born a pegasus, and is now an “alicorn” in her and her parents(WIP) eyes. she is not royalty, but still gets invited to fancy parties.  
she is sick and tired of being a joke. most ponies make fun of her tail and her parents being country folk.(shes more of a city gal)  
She has a crush on a pegasus (WIP) that as she flew toward equestria flew with her and told her all the customs.  
she has 3 friends(WIP) and they are not as nice as her(they are more like diamond tiara)  
she ended up picking up a mic and doing…. BOOM stand up comedy(bet you didnt expect that!)
 
the base i used is by https://www.deviantart.com/thememewizard