There are at least 16 different kinds of funny 'types' - and infinite variations. If you're writing any kind of sketch, script or novel, please consider an array of differentiated characters.

1. Angry ranter

2. Sarcastic/Wise-Cracker/Smart-ass

3. Dry wit/Straight man/woman

4. Neurotic Worrier

5. Practical joker

6. Doofus/Idiot/Moron

7. Pompous Buffoon

8. Clown (conscious buffoon)

9. Anarchist/Provocateur (political clown)

10. Gossip/Busybody

11. Dirty Boy/Girl (includes Potty-mouth & Double-Entredrers)

12. Inappropriate (on purpose or not)
    

13. Dizzy/Ditzy/Airhead

14. Space Cadet/Stoner

15. Nerd/Dweeb/Scientist

16. Mad Professor

And remember, they each get laughs in their own way. If you think of others I missed, please let me know.