Gonzo journalism or a journalist who produces such journalism.
"The editor fired the reporter for writing another gonzo piece about his own hallucinations during the war zone coverage."
conspicuously or grossly unconventional or unusual
"restaurants of bizarre design--one like a hat, another like a rabbit"
"famed for his eccentric spelling"
"a freakish combination of styles"
"his off-the-wall antics"
"the outlandish clothes of teenagers"
"outre and affected stage antics"
Using an unconventional, exaggerated and highly subjective style, often when the reporter takes part in the events of the story.
"Hunter S. Thompson's gonzo reporting turned a routine drug bust into a psychedelic adventure where he claimed to be the dealer, the buyer, and the arresting officer all at once."