User blog comment:Njalm2/Fundamentals of Love/@comment-1493741-20140301004635/@comment-28861328-20140302012801

It really just depends on your point of view, but "chemistry", in the sense Nanja is talking about is actually a fancy way of saying they balance each other.

My favorite romance stories, and there are only a few of them for me, are the ones where the characters are almost exact opposites, but their personality quirks counterbalances the other's in such a way, that you can't help but think "they fit together". That is an example of what I consider to be "chemistry".

Having a lot in common with someone can be just as unattractive to some, as it might be attractive to others, and has no bearing on how well they get along.

For example, me and my cousin are almost like brothers to each other. But he and I are so different, personality wise, that you'd never suspect us to be friends. Consequently, however, the weaknesses in my personality/skills are his strengths, and the weaknesses in his personality/skills are my strengths. And, while, at times this can mean we butt heads, we are almost inseparable.

In a legit romance, this would be magnified a significant amount, because there are other factors involved in a romance than would be in a simple friendship, but you get the point.