1. Jojos Bizarre Adventure, One Piece, and Gintama
2. Their worlds are just crazy and unique and they all seem like one of kind anime to me.
3. It doesn't really matter to me as long as the story and characters are enjoyable.
4. The shortest is one episode to 9 or ten episodes.
5. What I learned from anime is that friends are important to have and always know your true friends from the others. Also to always solve your problems with illogical violence.