Note to self: If KYM users get superpowers, then run. Run really far away. Hide. Pray. Burrow underground. Let death by any other means be your way out of life than being killed by them.
But seriously, if I must be categorized, then I'd be a lawful good in any sense. Perhaps I would deviate from the law depending upon the law, but I don't trust myself to make decisions that affect so many others.
On the whole, I believe that most laws and governments help to create an organized and civil society among people who are very normal in terms of "powers." If a person with a lot of power begins to act upon his own opinion as opposed to the consensus of the people, then the world becomes his to rule.
I have a bit of a utilitarian sense on whose opinion and values to consider. I value freedom as long as it doesn't harm others. So there's no way I'd let my personal opinions of what is right for people determine how I'd act with superpowers, and I'd certainly never act on those opinions. That's just unfair.
Some people may say that the world is unfair or that if other people had the opportunity that they wouldn't care about being fair, but what other people do doesn't dictate what I choose to do or believe. So, on the whole, I'd default to siding with the law.
Now there may be some instances where many believe the law is wrong and that it does not serve to help society or its people. But even In those instances, I would likely try to go through the system to change those laws before I tried to overthrow it. If you're trying to disrupt a system, you're still going to have to deal with the system until it is changed. A lot of people die when order is disrupted, and I'd like to prevent as much death and pain as possible on the way to a better system of governance.
And no matter what, I'd be "good." I don't want to get into a trite conversation of "What is good, really? But as I define it, I'd act for the good of the most people (like Captain Serious) with the state of the people in mind. I'd be more likely to be passive when a person has the means to take care of his or herself or when a person has brought ruin upon his or herself. But even in many instances, I wouldn't let a careless mistake cause the death of a person if I could help it. If there's a drunk driver, he crashes head-on into a sober driver and kills that driver on impact, then I would still try to save the drunken driver.
I would let the system deal out punishment than to deliver it myself or allow the circumstances to play as they will.
So yeah. Very lawful, even when I disagree with the law. Always good.