Angels are real, at least in my eyes.
My mother told me once that when I was little, she got this really strong aroma of her deceased mother's favorite perfume along with a gut feeling that something was wrong, so she went to check the kitchen.
When she got there she found out that our cat had managed to turn on the stove, but thanks to the feeling she had and her mother's perfume waking her up, she got it turned back off before anything could catch fire.
Another time, a few hours before her grandmother died in a hospital all the way across the state, she smelled the grandmothers perfume while we were sitting in the living room and the next morning when she called my aunt, she found out what happened.
I know that at the very least, I believe, for those reasons, that ghosts exist...but I'd like to think that those two went to heaven and just get to visit when they're needed.
I'm not sure if I'd say I believe in "bad" angels, though I do believe in bad, malicious spirits.
And I feel certain that when we lose someone we were close to, they leave us little signs to let us know they're alright and that they'll be there when it's our time to go.
A lot of the people closest to my cousin have had experiences (since his passing in October) where their radios suddenly turned up for no reason or things have moved that no one was touching, so I'd like to think that's him telling them all that he's okay.