[1] Halef is the exceedingly loyal servant, companion and friend of German adventurer Kara Ben Nemsi.
Halef accompanies Kara Ben Nemsi through all his adventures in the Middle East from Durch die Wüste to Der Schut.
He is married to Hanneh, the "most beautiful wife on earth", and with her has a son called Kara Ben Halef, who in later novels also has some adventures.
[citation needed] The German disco group Dschinghis Khan also released a song entitled "Hadschi Halef Omar" on their 1980 album "Rom."
Within the book series Karl May’s Gesammelte Werke there is a sequel of Am Jenseits: „In Mekka“ (1923) by Franz Kandolf.