You cannot choose your PhD guide in the NLUs. If you clear your entrance exam and interview, then the university will assign a guide to you based on your subject and the guide's availability and willingness. This decision is usually taken by a committee that looks after PhD related matters, rarely will the individual faculty's separate opinion be sought about it. The faculty also have an upper cap for the number of PhD scholars whom they can guide at a time, depending on their designation. For Professors it is eight, six for associate professors and four for assistant professors.

Well said. It is amusing to see how aspirants pose queries. They think they choose universities and guides, without realizing that universities and their faculty choose Ph.D. students. The question that a Ph.D. student should be asking is "Am I good enough to be selected by a good Ph.D. guide" not the other way.