Black Dragon

Who would've thought that Bushiroad would make an entire species of dragons an archetype? So far, from Red to Green to Gold to Blue, Bushiroad has been rather random with how they assign colors to dragons. I mean, Thunder Knights are as multi-colored as a rainbow. But the fact that they managed to settle down for some consistency is a nice change of pace. I mean, there's no Black Dragons in Dragon World, after all.

...wait a minute...Steel Gauntlet Dragon is a Black Dragon? Wait, so is Gust Charging Dragon? Wait, there's more?...did I discover something I wasn't supposed to?

Moooving back on topic, Black Dragons (save their Dragon World counterparts) are blessed with insane power and Spectral Strike, which is basically a semi-improved version of Penetrate. On the other hand, they have some terrible defense, but this doesn't matter if you play it right. There are other hidden weaknesses, but Black Dragons are overall very aggressive and have the right tools to really leverage their strengths.