Princess Cadence's mussed up haristyle from S3E12 reminded me of the Mechromancer from Borderlands 2 for some reason; it might have been the pigtail. Either way, this was bound to happen somewhere in the MLP community. Gaige's skill tree has a bunch of references to My Little Pony including "Evil Enchantress", "Fancy Mathematics", and "20% Cooler".
Original vector here: [link]
Borderlands 2 (c) 2K Games