In an interview to "NDTV", the 48-year-old termed the environment in the Indian dressing room as the biggest factor behind victory in 2011 World Cup and said Harbhajan was the funniest character.
Recalling how the "Turbanator" took the pressure off the team on gruelling tours, Kirsten said, "We had great characters too. Bhajji (Harbhajan Singh) was the funniest."
"Enjoy watching Virat. Love the way he takes control and finish games," Kirsten said.
He also said that Kohli's intensity helps the team lift itself.
The South African is currently in India on an assignment in Rajasthan for a coaching stint with the Rajasthan Cricket Academy. He was also the coach of Indian Premier League (IPL) franchise Delhi Daredevils.
Kirsten has also praised the IPL for it has helped India find young and quality players.