Sources inform that, “Aamir Khan developed his physique for Ghajini in a quick time and it has impressed Kunal so much so that he has been taking special tips from him for the role. He is also seen working out at Aamir"s personal gym. Kunal"s character is supposed to look very strong physically since he is playing a desi superhero kind of character. The film also requires him to learn certain skills; one such is 'Paco" also known as free running. Paco helps in building stamina and agility."
Doga is the alter-ego of an orphan Suraj, whom Daku Halkan Singh finds in a garbage dump as an infant. He is brought up by Daku Halkan Singh, but treated like a dog. While in Halkan"s care, Suraj witnesses endless horrors that ultimately led to his becoming Doga. To seek revenge, Suraj becomes Doga, and wears a dog mask to hide his identity. He is also considered to be the second most popular character created by Raj comics due to his huge fan following after Nagraj.
Kapoor loves to experiment onscreen and this role he says, is one of the most exciting and exhilarating experiences he has encountered.