Also question is, who is Shihab ud Din in Tughlaq?
Shihab-Ud-Din
Sadar Ratan Singh gains Shihab's sympathy by saying he is his adopted brother and that his father was killed by Tughlaq. Tughlaq finds this conspiracy, Shihab is killed. Shihab's honest words are that Tughlaq will be killed one day.
Secondly, who is Barani in the play Tughlaq? Barani never held a post, but was a nadim (companion) of Muhammad bin Tughlaq for seventeen years. During this period he was very close to Amir Khusro. After Tughlaq was deposed, he fell out of favor.
In this regard, who kills Najib in Tughlaq?
Najib : One of Tughlaq's ministers, Najib is poisoned to death by Tughlaq's step mother.
Who translated Tughlaq in English?
Karnad himself