The bonus chapter I like the most is:
1)the chapter 29.5: Kaname-sama and I, prior to the Night Class (between 29 and 30 chapter...)
When Aido made an interview on TV...XD
I add some pages...the most funny to me...
Yuuki didn't know yet that Zero was a vampire....!!! Poor Zero...!!!
3)And the last chapter that I like the most is a mix between fun and touching,it's the bonus chapter 39.5: A secret I don't know, where Zero made his tatoo and Yuuki called him a delinquent!!! ah ah ah...XD
Here some spoiler..Enjoy it!
then the side story becomes a bit deep
This last one is the best...!!! Because there are all the elements I like the most: the funny, the sweet, the love, the mistery, the grief.... And the first signs of the future relationship between the main characters...!!! Yuuki Kaname and Zero! XD I love Vampire Knight