That would be a tough act to follow. He had the shadow of someone else’s fame over him (Kerouac), and the popularity and mythos of the whole Beat movement. Burroughs had to attempt to claim himself not only as a writer but also as his own person. Fortunately, he wasn’t one to follow on the coattails of the fame of others. He was certainly a way better writer than Kerouac, and he was quite distinct from all of the Beat writers.
Finding works that Burroughs is in is rather difficult. I’m not sure how many books in which Kerouac placed a Burroughs character, and it wouldn’t surprise me if other Beats had also used him as a character. Burroughs is much more a cultural icon than PKD. I don’t know how to even begin to seek out fictional works that feature him, but I’ll offer what little I know at present.
As far as I can figure, William S. Burroughs first appeared as Bill Lee in Kerouac’s On the Road. Burroughs used this name later in his own work. He might of initially used it in Junky which he did intentionally to play off of Kerouac’s work. He chose to continue this mythologizing. He later used this name in other Works such as Naked Lunch which was supposedly a name given it by Kerouac. I don’t know if there are any other names that Burroughs went by in his fiction or the fiction of others.
The works of Jack Kerouac
Move Under Ground by Nick Mamatas
(A recent novel that mixes the mythos of the Beats with the Mythos of Lovecraft’s Cthulu.)
Drugstore Cowboy written and directed by Gus Van Sant
(Burroughs acts the character of a defrocked priest named Tom. He is loosely playing a character that is a mix of himself and his own fictional characters.)