Hundreds of Iraqis rallied Sunday to support a protest leader they want as prime minister instead of current premier-designate Mohammad Allawi, who they see as too close to the ruling class. Appointed on February 1, Allawi has pledged to announce his cabinet lineup within the week even as he faces ongoing protests against his nomination - and a new contender.

In the shrine city of Karbala, dozens of students took to the streets carrying photos of Alaa al-Rikaby, a pharmacist who has emerged as a prominent activist in the protest hotspot of Nasiriyah, further south. "We're here to show our support for Alaa al-Rikaby, the candidate of the people!" said Seif al-Hasnawy, a 20-year-old student.

Rikaby, who has a round face and closely-trimmed beard, began demonstrating in early October alongside others fed up with rampant corruption, lack of jobs and poor public services.

He has since risen to local fame with a series of videos posted on Twitter to his tens of thousands of followers, discussing politics and a path forward for the otherwise leaderless anti-government movement.

In one video last week, he asked protesters who gather at squares across the country to show whether they would back him for the post of prime minister, in a novel approach for a political nomination in Iraq. "If the people decide so, I'd accept," he said in his latest video on Thursday.

"This post has no value as such for me. I don't see it as a prize, but rather as a huge responsibility," said Rikaby, who has a tent pitched in central Nasiriyah targeted in a recent stun grenade attack.

In Karbala, university student Hassan Qazwini told AFP: "We protesters have numerous demands, and one of them is an independent prime minister without ties to parties - like Alaa al-Rikaby."

Allawi has until March 2 to form a government and Iraqi officials have quietly expressed scepticism that he would be able to complete it in time.