Why Klaroline is awesome!
The name sounds like a fancy perfume (What perfume do you use? Oh Klaroline it's from The Republic of Awesomeness.)
Klaus has a nice side that Caroline brings out, and Caroline most likely has a dark side, which Klaus could bring out.
They would so cute together, and Klaus would make Caroline feel wanted and boost her self-esteem (which Tyler hanging out with Hayley and throwing bottles at Care's head is most certainly NOT doing.)
Caroline would help Klaus with all the grief I think he feels (I think Klaus is the way he is because he was responsible for Henricks death, and that's why he wants everyone he hangs out with to be hybrid, so if he does get close to them, it would be harder for them to die, and therefore harder for Klaus to lose someone he cares about)
Once Klaus finds out what Damon did to Caroline there is no doubt in my mind that Damon would get his ass kicked by the original. This would be AWESOME! (I love Damon, so no hate for that)
Caroline agreed to go on a date with him, I don't care what the circumstances were, and that shows that deep down Care feels something for Mr. Big Bad and Original.
KLAUS HAS A BRITISH ACCENT AND MOST NORMAL AMERICAN GIRLS LOVE BRITISH ACCENTS. And that includes Caroline.
They are both pretty hot, Hot + Hot= Smoldering Goodness
They probably have a lot in common. We already know that both's fathers are jerks to them, they are both insecure, and they both have had it harder than anyone gives them credit for.
If they were together they would have the funniest banters.