I killed myself many DC. That’s no problem when you don’t have too great abilities. But remember that these characters are part of yourself and that their power evolves with yours. Some years ago, I began merging dream characters. With 10 of them for example, you almost make a dream god. A very powerful one. And when it becomes a habit, you begin to meet very powerful characters in non-lucid dreams, because some parts of you are used to do this alone - because of your LD experiments ! If you have too much agressive schemes in your psyche, you will then have very bad dreams, because you will be chased be powerful demons created by your own experiments. Even if you become lucid, it can be difficult. After 1000 LD or more, there are some characters I can’t overpower (let’s say a 150 feet fire demon). But I must confess that such characters only appeared after my merging experiments.
To see how you deal with your powerful DCs, you can try an experiment. During an OBE, go under you mattress and jump in the void, toward the lower levels. Call after the “mattress demon”. He is a great black shape which is “only” the equivalent of the merging of 8-10 DC (let’s say : a natural result of all your negativity). All my friends who searched for him found him. It seems to be a common psychic structure.
And when you find him… good luck !