I don't understand why there are so many Klaroline fan fictions online. And in all of them they either rewrite the entire story so that Klauss a is the good guy and Tyler is A bad one. Or they completely ignore everything Klauss has done and his complete lack of guilt..
There are only three ways I can see Klauss and Carolina getting together.
The first is that Klauss dramatically changes and truly regrets all the terrible things he's done. Not just to impress Caroline but because he begins to actually value human life. This is not going to happen because it's Too out of character for Klauss. He murdered Jenna Sommers, Carol Lockwood and all the members of Tyler's pack. He turnd Stephan into A ripper and is indirectly responsible for the dozens of people that Stephan killed during that time not to mention all the innocenc people he turnd so that Jeremy could complete his hunters Mark. And he has yet to show even the slightest shred of remorse for any of this.
The second way that it might be possible for Klauss and Caroline to get together is that he tricks Caroline into believing he's changed. This is highly unlikely because I don't think that Caroline would be fooled bye Klauss after everything he's done.
The third is That Carolina turn turns evil.