proedros
Headphoneus Supremus
A Scanner Darkly by the late, great Philip K. Dick
PKD is my favorite author , he was such a burning mind , a genius in every sense of the word (and then some)
you should definitely read these by him , amazing books all of them
i have read around 15 of his , but my top-5 is the one i will write below
VALIS
The 3 stigmata of Palmer Eldritch
The man in the high castle
UBIK
Do androids dream of electric sheep ?