Govinda
It is impossible to meet Siddhartha Gautama because he is not living. You could try to spiritually reach out to him though.
Not knowing what causes pain frustrates him.
In chapter 5, Siddhartha says, "Your mouth is like a freshly cut fig, Kamala."
They meet in Chapter 80
You meet Hatsuharu in chapter 13 of Fruits Basket.
Chapter 2
Chapter 47
Chapter 15 its named " The Cullens "
at chapter 18 or 19
Who is Smaug
They haven't meet each other
It is shown how they meet in chapter 144 of the manga.