Khureshi Abraam is one person.
I saw some theories saying that in Lucifer, there was an article mentioning that Khureshi Abraam could be one person, two people, or even none. But I think it’s just one person, and that’s Mohanlal. In the movie Lucifer, when that guy asks, ‘Kaun hai tu?’, he literally says ‘Khureshi Abraam.’ Some people were saying he said ‘Abraam Khureshi Abraam,’ but come on he said it in a James Bond style.
Also when you check the character poster of Lucifer shared by Prithviraj, it says Mohanlal as Khureshi Abraam. Not only that on Mohanlal’s birthday, Prithviraj shared a poster of Empuraan saying ‘Happy Birthday to KA!’ aka Khureshi Abraam. So I think the possibility of being two people is less.