The product of what happens when fuse the Cutie Mark Crusaders and Dinky Hooves. A young adult alicorn fusion mare who has much youth and energy in a single package. Young Heart is like every mare at high school age, devious and edgy. Willing to try new things for the experience while her virility demands more. Always eager to explore, she tends to drive her parents King Righteous Authority and Queen Fresh Care crazy sometimes. Watching as their daughter tries to wander off on her own adventures, usually in the princess going off and getting into some silly circumstance or trouble. The result being the embarrassment it brings to not just herself but the component mares in her head.
 
On the other side, despite her devious and rambunctious side, she teds to be a very kind and loving mare. Fitting the title of princess very well, earning the love and admiration of many other fillies and colts that look up to the young princess as an example. At the same time, to help out with her family, she tends to visit Canterlot to see her little cousin Tommy. More than often entertaining the little colt and making him laugh alongside his big sister figures, them being the babysitters/maids:iconcandyclumsy:and:iconrainbowtashie:
 
All around keeping her little cousin happy and in company. To help her human cousin relax brings her joy, as well as some pride that her component mares can revel in. Officially putting best cousin on their laundry list of accomplishments this young mare seeks to accomplish throughout her alicorn life. That and enjoy these absolutely comfy socks!