source description:
 
Excalibur is a Royal Guard for Celestia, but Celestia has assigned her to be Princess Twilight’s personal guard. Only after a few weeks of working with the Princess, Excalibur is questioning her job. She is suppose to protect and aid Twilight in any way possible, but Twilight has shown that she can handle most situation easily and enjoys the independence. So Twilight has said that the young pony can have a day off and do anything she wants to. The workaholic and seriously devoted Royal Guard doesn’t know what to do. In her confusion, she went to her good friend Velveteen Diva. Knowing her friend, Velveteen recommended taking some time to think about it by having a “me” day (secretly tricking her to take Twilight’s advice).
 
Mayor Mare + Glen Favor (Royal Guard) = Excalibur  
Diamond Tiara = Babs Seed = Velveteen Diva