Welcome to Dreamviews!

Technically a lucid dream is any dream where you realize you're dreaming. This can range from a 5-second "hey look I'm dreaming" dream, to a long, perfectly controlled dream. As long as you know that you're dreaming.

I've had the problem with DCs (dream characters) trying to prevent me from becoming lucid as well, and I've read about others with the same problem. DCs usually don't believe that they're only dream characters, if you talk to them, so they're probably trying to make sure that you don't start questioning the reality of the dream. If you question the reality of the dream, you're questioning their reality.

On the other hand, some people have talked about dream characters who try to get them lucid or even help them control the dream. I guess everyone's dream characters are different.