Aatrox would be perfect for your taste if not for the fact he screams the entire time you play him. A bit too obnoxious really.
But then again, there is always Trynd. And Riven, if you counter her R.
.......
I'd love to see a champion who does thrust out his sword in a big arc, who does a flip in some-sort of combo ability, who does hit you so hard you go flying.
Also just fyi, that's actually how to NOT use a sword. Sword has always been a precision-based weapon at its core barring a couple specialised variants of the default design philosophy. The way most medias portray the use of swords, that's more akin to the use of blunt weapons that goes smashing and crushing instead of slashing and thrusting as well as comboing instead of counter-based tactics (******), is not actually how swords are meant to be used. Just so it's clear.
(******) While say, for instance, Chinese sword arts do include ones where sword uses are more free flowing and may include combos and whatnot, sort of... but that's more to do with that swords are commonly incorporated into other martial techniques such as unarmed hand-to-hand combat in China, hence the more somewhat unorthodox use. For the overall uses of swords as a whole, it is mostly focused is on tactical footwork and counter.