Majin

The Majin are the nomadic desert dwelling tribe of Sahara Island, where they originate and live. They currently live outside of the Saharan kingdom, in the wilderness of the island, and make due as merchants and traders. Dating as far back as to when the Majin received their current name, the tribe has constantly feuded with the Saharans, making both sides bitter enemies. Despite this, there have been steadily increasing attempts to bridge peace and cooperation between the Saharan kingdom and the Majin tribe.

Biology
As a rule of thumb, one can identify a Majin tribesman by identifying them as fully human, with the odd trait of having pointed ears as opposed to an average person's rounded ears. Aside from that, their anatomy is equally similar to that of a non-Majin, and as such, can easily breed with those outside their tribe or other human-like beings.

Due to spending a good deal of their lives in a desert environment, the Majin have proven themselves to be highly tolerant of extreme temperatures; be it scorching heat or bitter cold. They've also developed an adaptation that allows them to go for longer periods of time without water than normal humans.

Trivia

 * The name for the tribe was chosen to refer to djinn, otherwise known as genies; and thus, the tribe is given a middle eastern and magical theme to reflect upon this decision.
 * Additionally, the other possible meaning behind the name helps to emphasize how they're treated by the Saharans, as Majin can also mean "evil people" or even in some cases, "devil."
 * Currently, the Majin have appeared in three separate stories; they take a more prominent role during the Mizu Saga in One Dream, and have made one cameo and were alluded to in the Orphans of Sahara arc in New Horizon!; only to later unveil Olympus as one of the story's major antagonists. Additionally, Ignis D. Hiro is the main protagonist of the story, One Piece: Undying Dreams.
 * Currently, Ignis D. Hiro and Sarutobi are the only known half Majin; with Hiro being born to a Majin noble and a non-Majin, and Sarutobi having been born to a Majin and a bigfoot.
 * Additionally, Ignis D. Hiro is the only known Majin with the "Will of D".