Macbeth comes from a long line of ponies with freakishly apropos Shakespearian names · 3:02am Oct 23rd, 2012
His mother and father were named Montague and Capulet, and they killed each other in a murder/suicide. He has a half-brother named Macduff, who was born via Caesarian section (except since there is no Caesar in Equestria, it's called a Cadenzasection), and the two periodically feud over their grandfather Duncan's estate. The climax of Pony Gear Solid will involve Twilight and Snake raising an army to help Macduff lay siege to Macbeth's fortress of Dunsineighn.
Spoiler alert.
Can't forget Bottom, the donkey who gets the head of a human
And Puck, the secret true villain Oberon's hockey-hating rubber plant tentacle-rape-beast in the clop scene in chapter 42.
Oh, and epic music. Because the reason.
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