Riot had to retroactively change Diana's skin because it looked exactly like Syndra, dude
But yeah, I get what you mean. I'm really enjoying Rengar right now, and noone can deny Draven is one of the most stylish champions released. Riot needs to fix their powercurves and mobility creep, though. At least Rengar has limitations on his jump, but Kha'Zix is insane, especially with all the assists on Dominion.
In other news god damn you have to try Rengar on Dominion. Prospectors + boots -> defense boots + necklace -> phage -> sanguine blade -> trinity -> defense. Try to skirt the edges of fights unless you have a clear path to the squishy, go in, gib them, slow them, run away. I see a lot of people underestimating Rengar's potential burst, and that has costed a lot of deaths. I had a Kha'Zix jump on me with full hp, when I had about 400 health left - I exhausted him and gibbed him about half-way through the exhaust because I had 5 ferocity.
The jungle provides for excellent jukes and assassinations. Hide in the brush above stormshield, wait for the enemies to train top in a single file if your team owns it, jump on the last guy, gib, run to bot, gib, laugh maniacally. My last 4 wins I've had >20 kills. You have to be careful early on, though, because you can be kited and are relatively squishy.
I max bola strike first because I like the slow and the poke is useful for the fight top and for finishing off runners, then Q. Don't be afraid to use the ult defensively, because that defense very quickly turns into offense past mid-game because surely at least one of their team is going to be low and trying to run away from the fight - kaboom. Also don't forget to gank bot, especially when you see a fight brewing there, because a lot of times the enemy bot will just rush your bot when he kills your guy, leaving him deliciously exposed.
Man I love Rengar. He fits my playstyle so well. I'm not sure about the taking of too many kills, though. It starves people. Occassionally it makes no difference, because I often get triple kills, but other times it visibly hurts my team. Rengar doesn't really need a ton of items, I'm sure sanguine + sheen is enough, so if you have a lot of other assassins or a carry you might want to let them have some kills. On the other hand killing everything that moves is really fun.