We will probably never know who was the first Black creator to adapt Lovecraft to the medium of comics. Pre-Code Lovecraftian Horror Comics rarely credited their writers and artists; it is not impossible that one or more uncredited toiler in a small horror comic shop was Black. So too, there may be some obscure comic that hasn’t come to light yet where an early artist or writer applied their talents to a Lovecraft adaptation that has so far escaped notice. Such things happen, and when they come to light push back “first” a little further.

That being said, the first Lovecraft comic adaptation by a Black creator that I’m aware of is “H. P. Lovecraft’s The Ter’ble Old Man” in the underground comix Laugh in the Dark (1971, Last Gasp), by Larry Fuller.