If we're giving suggestions - sorry, I'm new to this, not really sure what regular members are allowed to say - I'd definitely think it'd help you to expand a bit on his personality. You've got a lot of the basic traits of a Sith, and I'm certainly not someone who dislikes that "typical Sith"...
It's always good to see another Sith that isn't afraid to to embrace the dark and dirty of the culture.
Let's just hope this one doesn't get too big for his boots. Wouldn't want to trim our own numbers too much ;)
Alternatively, here's a normal welcome from a normal person.
Hi, hello, welcome! I'm sure you'll enjoy yourself here. The place is full of friendly people and their friendly memes.
Wait, Relent is male? But his avatar is-
This is truly the greatest of deceptions. Maybe I'll stop assuming genders from now on. Anyhow, yeah, welcome to this crazy world, P! The people here are fun and the writing's good, I'm sure you'll enjoy yourself~
Crash and burn this universe, more like. That sounds like a wonderful idea to me~
Would definitely love to write with you, though. And anybody else, too. I'm not a picky chick.