Briar and Bramble

Briar and Bramble are a pair of villainous characters from the rebooted Ducktales series, appearing only once as side-characters in the 11th episode : they are based on the legend of Kelpies, a type of Scottish water-demon often taking the form of a horse to drown innocents, due to popular culture they are envisioned as ponies rather than full-on horses and are voiced by Tara Strong and Andrea Libman (both famous for their work in My Little Pony) - thus they are parody of both Scottish legend and the MLP subculture.

History
Briar and Bramble are a pair of Kelpies, magical creatures similar to fairies but with more malicious natures, they take on the form of rather innocent ponies but are not very skilled at guising their intent to kill the protagonists, being refered to as "murder ponies" - they try to tempt the group into riding their backs in order to drown them but due to their blatantly murderous nature the group opt instead to wander off without them, making the Kelpie pair rejected and commenting on how the ducks were "the least fun victims ever".