Keter
The Renegade
Keter was never actually properly trained as a Sith so by formal standards, he sucks. Instead he did a lot of experimentation and discovering how to do things his own way. His disconnection from his actual senses (due to loss of his eyes) means his actual sensing abilities are nil. However, instead he specializes in reinforcing his body using the force to pull off athletic feats. As for saber forms...he's casually read a few manuals on them but prefers his own style - which mostly involves stylish flailing...