Now, I'm assuming this means "first scene a character was in" and not "walking into a room" kind of entrance. It took me a while, but I found an awesome entrance.
CASTIEL
Because... because it was just epic. Look at it!
Day 22 - Your favorite minor character Day 23 - The character that is most like you Day 24 - An episode you wish never happened Day 25 - Something that you wish happened but didn’t Day 26 - Your favorite SPN fanvid Day 27 - Your favorite season premiere Day 28 - Your favorite season finale Day 29 - Your favorite SPN fanfic Day 30 - Your favorite MOTW Day 31 - Anything SPN related