Mohamad Hamdan Dagalo, known as Hemeti, has tried to reach out to Sudan’s pro-democracy movement.
Near-weekly anti-coup rallies have taken place in Sudan since the October 25 coup led by General Abdel Fattah al-Burhan.
The clashes follow intercommunal violence between Hausa and Birta ethnic groups in July that left 105 dead.
The UN says at least 258,000 people have been affected by the floods in 15 out of 18 provinces.
The protester became the 117th person to be killed in demonstrations that have occurred weekly since last October.
The Horn of Africa is experiencing its worst drought in 40 years as a fifth consecutive failed rainy season looms.
Unions played a large role in toppling former leader Omar al-Bashir, but have been sidelined since the military coup.
The ambassador arrives as Sudan is experiencing widespread unrest, with protesters calling for an end to military rule.
The United Nations estimates that 136,000 people have been affected so far – and that this number is likely to rise.
The army says it supports ‘The Call of Sudan’s People’, a political initiative to pave the way for democratic elections.
Refugees in the Blue Nile say their conditions are becoming increasingly desperate as help fails to arrive.
Violence in Blue Nile state triggers protests in several cities.
Clashes between two tribes have killed at least 79 people, wounded 150 others and left dozens of shops torched.
About 150 others have been wounded in the southern Blue Nile state since the clashes erupted a week ago.
