Option 1 states that the Ryotwari system was the brainchild of Thomas Munro. This is incorrect. The Ryotwari system was actually introduced by the British in India during the colonial period.

Option 2 states that the Ryotwari system was meant to reduce intermediaries. This is a correct characteristic of the Ryotwari system. Under this system, the British eliminated the zamindars, who were intermediaries between the peasants and the state, and established direct control over the peasants.

Option 3 states that cultivating peasants were gradually impoverished by the system. This is also a correct characteristic of the Ryotwari system. The peasants were burdened with heavy taxes and rent, which often led to their impoverishment.

Option 4 states that the Ryotwari system was introduced in parts of Madras and Bengal Presidency. This is another correct characteristic of the Ryotwari system. It was introduced in select regions of Madras and Bengal Presidency.

In conclusion, options 2 and 4 are the correct characteristics of the Ryotwari system.