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Jedi Master Quinlan Vos is one of the more interesting Jedi to come out of the fallen Republic. He's actually one of the few "Gray" Jedi - or Jedi that don't quite adhere strictly to the rulings of the Jedi Council and who prefer to follow their own path or to those Jedi that dance between the light and dark. The so-called "Gray" Jedi include Jedi Masters Qui-Gon Jinn, Jolee Bindo, Jacen Solo and the Imperial Knights.
They're modern day Ronin - Master-less Samurai.
Jedi Master Quinlan Vos is most renown for having mastered Form VII of lightsaber combat - also known as Vaapad - a style that required the use of both Dark and Light-side Force techniques; training Jedi Master Aayla Secura, and; for falling to the Darkside - but came back.
He's also one of the few - if not the only - Clone War era Jedi to use a blaster.