Clackers (クラッカー, Kurakkā) are a weapon that Joseph Joestar wields, featured in the second part of the JoJo's Bizarre Adventure series, Battle Tendency. They also make a brief cameo in the eighth part, JoJolion.
Joseph first uses three pairs of American clackers against Wamuu, infusing them with the Ripple.
Rohan Kishibe (岸辺 露伴, Kishibe Rohan) is a secondary character featured in the ninth part of the JoJo's Bizarre Adventure series, The JOJOLands.
Rohan is a wealthy and successful professional manga artist, having created the series Pink Dark Boy, which has an anime adaptation. He is on a sightseeing vacation in Hawaii alone, staying in a villa on the Big Island of Hawaii for 15 days. He is a Stand user who wields Heaven's Door, which allows him to turn people into books for him to read.
NYPD Blue (NYPDブルー, Enu Wai Pī Dī Burū) is the Stand of Fukashigi Nijimura, featured in the light novel JORGE JOESTAR. It takes on the appearance of a human police officer and is actually sentient. It has the ability to remotely look at all police records, record and broadcast what it sees, and use a gun.
"Light and Darkness" (光と闇, Hikari to Yami) is the first number of the JoJo's Bizarre Adventure: Phantom Blood musical. It was a rap performed by YOUNG DAIS, the actor of Robert E. O. Speedwagon.
