It's more a matter that you (and I, and all of us except Jesus and perhaps Francis of Asisi) do have both of these personalities and are much better off when we accept that we do. Keep writing, and keep writing honestly. It is a gift. If the result strikes you as unpublishable, you can always do a rewrite for publishers.
I've read that authors often find themselves dialoging with their characters. In fact, the characters often tell the writer when they are being portrayed badly. ("Me? Use a knife? C.mon, you know what a careful dresser I am! Risk bloodstains? Not me, I'd use poison.") You're even more ahead of the game having them act things out.
You're aware, I presume, that you are really writing your story, learning about the various aspects of yourself. But do keep something in mind: death in dreams is not a permanent state of affairs. I'm fond of saying, "Just because (a dream character died) is no reason not to set his place for supper." I doubt you've seen the last of Kevin.
What happens in a movie? One guy shoots another, who falls down dead. Then the director yells "Cut!", and everybody goes off to the canteen for a coke. Same in dreamland.

Some further thoughts. A few months ago you were dealing with dreams where men were trying to get you to be sexually assaultive and finally assaulted you. You stood them off. I see a variation on that theme here. Having failed with a direct attack, now your psyche has created a scenario where "good" men are victimized by an "evil" woman. In fact, the male in you is even dominated by that woman in an undesirable way. A question you might ask yourself is, "How do I want this to turn out?"

I have some familiarity with writing up dreams and know it is not always pleasant; but it serves at least one important purpose: it literally gets this secret stuff outside of you. When you post here or show others your writing, it lifts the veil of secrecy even more. You already have a good handle on this; but the going public gives you an even greater measure of control. I'm not one of those who believes Ego has to dominate or totally control Psyche; but it does have to be proactive.

What's odd is that this isn't the first dream where women were "Evil." I've had dreams were each gender has been "evil" and I guess it all depends on the situation. I guess I don't mean "evil" as much as I do assaulting. It causes some serious confusion.

But, in each of the dreams, I actually feel something different. When a woman is attacking men, I tend to feel overwhelming sadness and depression throughout the dream. Usually, in those kinds of dreams, like this one in particular, it is one woman versus several men, and one of them, one that I'm playing as, has to save them from her and protect them, but I always manage to fail. I don't have many dreams like this, but when I do, they depress me, usually for the remainder of the day. A strange similarity between them all is that she is keeping them hostage, usually captive in cages or crammed in rooms, and she torments them ruthlessly.

The opposite dreams, where men assault ME specifically, I just feel scared and run around a lot, but I haven't been having those dreams anymore.

I really hope that these dreams don't mean that there is a violent side to me, and I don't mean just an angry side. I never wanted to turn out violent like my parents.

Rose, there is a violent side to all of us. That is not to say, however, that you "are" the Evil Woman and are somehow fated to become an overtly violent person. (In fact, that your dreams cause you to worry about that is a good sign, in my opinion.)

One thing dreams do is introduce us to parts of ourselves that we've suppressed or repressed. That's usually through dream characters acting out a dream plot. It's been seriously speculated - by me, among others - that characters whom we encounter repeatedly are sort-of partial selves. In the cases of schizophrenia and multiple personality disorder, they may evn try to take over the Waking Ego function. In working with them, we tend in time to incorporate them into ourselves in a way that lets us function well with ourselves and society. Writing fiction is another way we do that.

Now, please keep in mind that I am not a psychoanalyst. What I've learned is almost entirely from dreaming and keeping dream logs. You say you don't want to turn out "violent like my parents." If both your parents were violent, that suggests you may, (I emphasize, may), have a genetic tendency that way. That may be what this dream struggle is all about. But that you're waging it means you're winning it. Whether it's an actual or potential character defect, we begin to master it when we acknowledge it and own it.

I, too, have had days where dreams set the tone for my feelings. Again, down to a point that's good. It shows you're taking them seriously and getting the message. It helps to remember, though, that in many ways dreams are like plays or movies, real only down to a point. The nice part is, you're the star. The bad part is, you're the only one who hasn't seen the script.

(By the way, Evil Woman certainly strikes me as a Pejorator.)

I guess when I think hard about it, I don't like the bad side of me. A lot of times, I think that it means I am cruel and I don't want to be, because I don't want to hurt people. Whenever I feel angry at someone, I feel two emotions constantly conflicting with each other, and I don't know if that's even normal. Sometimes my anger at another person will suddenly have me enraged at my own self.

It's like I suddenly feel like I want to hurt someone, but I think if it's anyone, it should be me, because I think horrible things about myself, and what's worse is that I find that insulting and pathetic, because I become so frustrated when people spend all of their time telling me about how they hate themselves. I can't accept that I'm just as pathetic as they are.

And then I feel horrible for saying such things about them and myself. That's wrong of me. I shouldn't think such things about people. Everyone has problems, and I shouldn't treat them differently, even if they treat me differently.

This conflict happens back and forth, constantly, so often that it causes me stress. I don't want to be hateful, spiteful, angry, or violent, and then I think, I don't want people walking all over me and ruining my life by trying to get me to care, and then not caring about me or my problems. I feel like I'm a good person, and a horrible person at the same time.

I try to be kind to make up for how often I've been dismissive to people. I try to love, despite how much I hate and detest people. It's like I can't pick a side and stay on it. I have to both love and hate people, with no calm peace in the center. I just want to find a balance. To be able to feel neutral sometimes, to accept that everyone is different at all times.

I'm sure everyone goes through this struggle, but it doesn't feel that way. It seems like everyone has it easier being themselves and not hating everything they do, wishing they were a better person. But I can't get into their heads to see that. I know that everyone gets this way, I don't have to see it.

At times, it can almost feel like two different people talking to me about one subject, and both of them are very loud, and won't let it go until they have their way. Love people, hate people, be there and comfort people, hurt people, but whatever you do, don't let them see the other side of you, because then you'll be weak. And then they'll strike at you and tear you apart.

You really hit it on the head when you say that (a) everybody feels this way, and (b)it doesn't feel that way. It's no solution to this problem, but it helps to keep it in perspective, to remember that all these issues we feel so deeply and personally are in fact universal; and that the person you're with who seems to have it all together is in fact wrestling with demons of his or her own. Or - and this is worse - has repressed them and really thinks he's a "wonderful person."

It helps to remember that even Paul, a saint and apostle, said "the good I would do I do not do; the evil I would not do, I do." In fact, a later Christian writer said that there are two kinds of people. There are sinners who think they are saints. Then there are saints, and they know they are sinners.

Trust me. For all that what you're going through is unpleasant and all but literally painful, you're better off being conciously aware of your bad side (and I'm not sure that all that we call agression is necessarily "bad") than kidding yourself that you're a total goody-goody. Paradoxically, it's that very awareness that gives you greater control. You can't fight enemies you refuse to see.

It does no good to hate yourself; but there are times when it's okay not to like yourself all that much. Think about it. As an old song says, when that happens, "Pick yourself up, dust yourself off, start all over again."

This amateur hereby diagnoses you as suffering something called The Human Condition; and states: the prognosis is excellent. Your psyche is teaching you some hard lessons. Believe me, they're worth learning.