2. Squidward Tentacles

 

3. Scooter

 

4. Bubble Bass

 

5. Mr. and Mrs. Squarepants (though they're pants are not square)

 

6. No.( there are a few episodes where spongebob is either, 1. angry, 2. sad., or 3. non conforming)

 

7. Squid on Strike

 

8. Mermaid Man and Barnacle Boy

 

9. Yes

 

10. Of course