There have also been two new special committees set up. The Environment Response Committee will be charged with looking at the council's policies around environmental issues such as climate change. And the Economic Development Committee is aimed at helping businesses drive economic development in the city.
Southgate said she had come up with the structure after meeting with all the elected members.
"We have one job to do and that's to do what's best for Hamilton – it's really that simple.
"We have some very experienced elected members around the table and yes, we will maximise that. But we also have some very passionate emerging leaders with a lot to offer and it's important they can and do fully contribute."
Former deputy mayor Martin Gallagher has been tasked with training and providing mentoring o the three new councillors.
The proposal will be officially confirmed at the first full council meeting on 28 November.
The committees:
Finance: Chair Rob Pascoe, Deputy Chair Maxine van Oosten
Strategic Growth: Chair Dave Macpherson, Deputy Chair Ryan Hamilton
Infrastructure Operations: Chair Angela O'Leary, Deputy Chair Martin Gallagher
Community: Chair Mark Bunting, Deputy Chair Kesh Naidoo-Rauf
Environment Response Committee: Chair Margaret Forsyth, Deputy Chair Sarah Thomson)
Economic Development Committee: Chair Ryan Hamilton, Deputy Ewan Wilson
Hearings and Engagement Committee: Chair Martin Gallagher, Deputy Chair Angela O'Leary
Risk and Audit Committee: Chaired independently