Black is the first Kamen Rider to forgo wearing the characteristic muffler (scarf), worn by all past Riders. He is also the first with a sleek armored look (in this case, almost form-fitting), which would be the case for pretty much all Riders created since.
The first Kamen Rider series created by Shotaro Ishinomori alone. Franchise co-creator/former producer Tôru Hirayama was involved early in production (and was in a conference with Toei Studios executives and a group of fans, to discuss ideas for a new Kamen Rider movie, which instead resulted in this series), but was ultimately uncredited. This may also explain the lack of Gorgom having henchmen (which were a staple of Hirayama's in all past entries). Instead, in a few cases, Black fights multiple clones of one monster, as was the case in the first episode.