First things first: English-language haiku don't have to have 17 syllables, or be in a 5/7/5 syllable count. I know that's what you learned in school - if you live in America, that's what everyone learns in school. Trust me, it's wrong. I've been studying haiku for seven years now.
What haiku should do: describe rather that tell you what to think or feel, contrast two images against each other to evoke a response in the reader, surprise the reader with the journey. Generally, they tend toward a short/long/short syllable pattern, but there are one, two, and four line haiku out there as well. If you like the form - and you like Supernatural - be sure to Google scifaiku and horrorku!
I hope you liked these! (Some adhere more closely to the guidelines above than the others. The 5-line poem is actually a tanka, and the one-liner a monostich.) I wrote the first one and then decided to try my hand at a few more characters.
So ... on to the answers! Were my poems successful? Did you guess correctly?
5. Crowley, although there's some Dean in there, too
6. Lucifer & Sam
As always, I don't own Supernatural or any of these characters. If they were mine, I'd treat them better!