Conversation so far:
What is Saturday Night Live and its relationship to John Belushi?
In 1975 Chevy Chase and writer Michael O'Donoghue recommended Belushi to Lorne Michaels as a potential member for a television show Michaels was about to produce called Saturday Night Live.
Are there any other interesting aspects about John Belushi besides being recommended for Saturday Night Live?
Michaels was initially undecided, as he was not sure if Belushi's physical humor would fit with what he was envisioning, but he changed his mind after giving Belushi an audition.

Question: which characters?
Self-contained rewrite: Which characters did John Belushi portray on Saturday Night Live?