Lee Kuan Yew
Lee Kuan Yew started an opposition part called the People's Action Party. He became the first Prime Minister of Singapore when PAP won the most seats in the legislative assembly. However, although he faced many setbacks and failures, he did not give up his vision for Singapore and even turned Singapore from a third world country into a first world metropolitan city.
Lee Kuan Yew was not afraid to be blunt about certain truths and he often gets on people's nerves for doing so. A tenacious guy, he does not give up readily and he will be determined to fulfill his vision. Lee Kuan Yew was a humble man and he did not become proud whenever he achieved something great.
I think a good leader manages crisis under stressful situations by keeping calm and analyze and think before executing any decisions. This is due to the fact that if they make one wrong move, it would become a serious problems. They would seek advice from one another too.