When I started in my first Eberron campaign, I was tasked with playing a defender. Not one for classic classes, I tried to find something more interesting. I found the Swordmage. Or, as I discovered a few minutes after reading it, the Jedi Knight. Years later, I would apply that thought process and create...
|Vader's Apprentice, Unleashed!|
|It's all about the Force Lightning...|
It's surprising how easy some of this stuff comes. On the original version, I also gave him a magical item (the Farbond Spellblade) that let him throw his lightsaber 5/10. However, with these versions, I wanted to keep them magic item free so the dispensing of magic items at D&D Encounters could be more relevant.
Combining the lightning Genasi with lightning based Swordmage powers yielded a significant amount of "Force Lightning" that works reasonably well with the character. Although you may not quite get the 100% Sith Lord feel you're looking for, you do get some interesting play out of our friend Starkiller, enough to really influence the way you play with him.