Playing an Assassin
I just played my first game with a drow revenant assassin. I took the Drow Soul feat at first level, which allowed me to use Darkfire and Cloud of Darkness, in addition to the cool revenant features like Dark Reaping and Unnatural Vitality and the stat synergy.
I found that the drow features synced well with the feel of the assassin. Several times during the adventure, I used Cloud of Darkness to obscure myself for that round and the next, then before it dissipated, I used Shade Form and the subsequent Stealth check to stay hidden another round.
Once, the DM used a Doppleganger that looked like me to confound the other players with the "which one do we attack" gag. I could've called out something that happened earlier that only the PCs in my party would know (not the doppleganger), but instead I light him up with Darkfire, went into Shade Form and my party wailed on him.
I also liked staying away from the big melee bruiser while the fighter marked him and softened up. I stayed at the edges of the battle, taking out his comrades, but dropping my shrouds on him. Then when I had 3 or 4 on him, I teleported next to him, nailed him with a Shadow Storm while invoking my shrouds. Very nice.
For now I'm using a longsword and a shield for the extra proficiency bonus and AC, but I'm open to new weapon combos