(That was a bit... I dun know. But since it's in her bio Xander is caught between two hearts, Cross and Karma.)
((Well, not quite just yet. I feel as if I should help Xander out a bit and explain a little more about Karma and her oh-so-stubborn personality x3
Right now Karma isn't interested in Xander in "that way" (but don't fear!) just yet. Those few moments they have together she begins to feel something towards him, but as I said her stubborn personality will push it down (also her past has a lot to do with this). Karma is very wary of others and has trust issues (as you see her with Vanth, even after all that time she's still cautious). If Karma wanted to be with another there'd be certain traits she's looking for: trust, respect, loyalty, strength (and this doesn't mean physical), and so on. So Xander meets some of these traits but others cause Karma to keep pushing him away, one of them being with his interest still with Kali. She will not try to compete for someone's affection (and no I'm not saying Xander should stop thinking about Kali completely, this is actually what makes this interesting and more meaningful XD), it's not in her nature and she's just not that type of girl. And this also explains why she took Xander's attempt to make her jealous so offensively.
She's also not the type to be with someone who's clingy and overly protective, she actually hates it when
anyone jumps in to try and "save" her when she's well capable of doing it herself, even if her brother did it. There would have to be a few reasonable reasons for the act for her to let it slide, but in general it makes her think that her "protector" thinks of her as weak and unable to fend for herself (these aren't necessarily for Xander just a few extra facts of Karma). One of the reasons for having someone else to jump in would be like if she were outnumbered or severely injured.
So there you are, I may add in a few other things through the RP if you need any more info, but those are the basics ^.^
In order for Karma's feelings to get stronger Xander will have to prove himself a few times which could happen in the RP, just like a few special moments that happen though the RP, maybe they even have this huge fight (like not a 'to the death' battle) but something that releases some of their frustration and anger towards maybe one another and all that's happened, you know? Haha.
Karma is a very special character of mine, I don't want her just falling for anyone and not do a kind of "love at first sight" thing, that's why this is taking awhile :p))