In the twelth episode of the show's first season, "Call of the Cutie", something indeed magical happens. I give you: Ultra Pony Roller Derby.
I point out this 23-second scene not merely because I'm a fan of the show but because it's a sign of what I regretfully must call derby creep (by which I do not mean that guy who hangs out at the rink). Representations of roller derby in popular culture vary pretty wildly from relatively accurate to barely worthy of the designation, As derby spreads, so too do the shout-outs in pop culture. The My Little Pony pop-up is noteworthy particularly because though the show has a broad fanbase, it is theoretically aimed at a young audience. Young potential players, referees, NSOs and fans are growing up as we speak: the more they see of the sport, the likelier they are to check it out. The more normalized derby is, the quicker its spread. Given the sport's high turnover of players and the sheer crowd of folks you need to run a bout, we need to look forward to encouraging future members of the derby community.
While higher incidences of representations of roller derby in children's programming naturally means taking some bad (inaccurate, demonizing) along with the good (realistic, encouraging), it's one small duck walk for a cartoon derby player and one giant pegassist for roller derby itself.