PostCrush

Kiwi Lollipop, also known as K-Lo, and Supernova Zap, also known as Su-Z, are two female human characters who appear as the antagonists of My Little Pony's hour-long special Equestria Girls - Sunset's Backstage Pass. They are a pop music duo under the name PostCrush.

Why They Are An Awful Pop Music Duo

 * 1) They are shown to be rather dull and forgettable villains who aren’t really that interesting to the viewers.
 * 2) They use the time twirler until their show is perfect, which just proves that they are just trying too hard, making them Mary Sues. Nothing and no one is perfect.
 * 3) They are poorly written due to the fact that their goal was just to make their show perfect, and they aren’t even a huge threat to Sunset Shimmer and Pinkie Pie.
 * 4) Kiwi Lollipop is just shown to be a girl who isn’t really that much other than being claimed “cool”, while Supernova Zap is just an obnoxious idiot who also isn’t all that amusing.
 * 5) Much like Juniper Montage, their redemptions aren’t really that good compared to other redeemed Friendship is Magic/Equestria Girls villains.
 * 6) Both girls are stereotypical alpha bitches.

Good Qualities

 * 1) Their song “True Original” is pretty good.
 * 2) Their character designs are admittedly cute.
 * 3) There's a solid piece of foreshadowing wherein the performance we see of them, they screw up a little, setting up them being the masterminds behind the time loop.
 * 4) They redeemed themselves at the end of the special.