Just a thought as Im working on a series of punk/alternative pony artwork.
Admit it, everyone here went through the emo/goth phase at school. I certainly did big time. Which of the mane 6 do you think also went through the phase when they were teens?
I personally think Rarity and Rainbow Dash did. Rarity probably tends to deny it happened though, but a few things in the series makes me think she did. The angry guitar solo, the instant adaptation to her punk look and how she is an expert at "wallowing/drowning in her emotions" - goth kids 101 right there.
Dashie, because shes rough and probably liked the style and music more than the "darkness is my life" part.
I dont think the others really tried it out at all. Twilight invested in studies all her life, Pinkie is too happy and hyper, AJ probably has no idea what it is and Fluttershy may have found it too scary, or she's more hippy.