I always like to imagine what a characters evil counterpart would be like. Both Treble and Hack have evil variants (Hack stars as the main villain in one of my other stories).

So, what would be the evil version of your OCs?

5422811 It took me a while but I created one: Dark Knight. (No not batman!)
Unlike Silver Knight, Dark Knight has black, spiky hair, red eyes and very dark blue skin.

He wears a purple shirt with his shield emblem on it. But the shield is broken in 2 by a dark comet on it
He also wears a long black trench coat, fingerless gloves with spikes on the knuckels.
Still wears his blue jeans with black army boots.

Accessoires: A dark crystal necklace and a sapphire ring. The last thing he got left from Rarity.

His personality is based on Vanitas from KH: BBS