The annual budget to fund all the Māngai Māori was increased by $34,400 to $102,400 to reflect the extra hours now required.
The council also confirmed that professional development for Māngai Māori representatives would be provided.
Mrs Southgate said having council unanimously reaffirm the Māngai Māori partnership indicates the value it has already added to the decision-making process.
"By 2038, a third of people living in our city will be Māori," Mrs Southgate said.
"Frankly, how well we do as a city hinges on a strong and collaborative relationship with Māori."
"The Māngai Māori representatives are highly skilled people in their own right with significant credentials and mana. They are important advocates for tangata whenua and their involvement on council allows us make more durable decisions for the city."
In 2018, Hamilton City Council approved the appointment of Māori representatives for the then four committees, where one sat on the growth and infrastructure committee, two on the community and services committee, one on finance committee, and one on the regulatory hearings committee.
All five Māngai Māori appointees are members of the Hearings and Engagement Committee, for items relevant to their portfolio.
"Hamilton was courageous in pioneering an innovative model of Māori representation that has wide support," said Mrs Southgate.
"What the Māngai Māori bring to council in terms of their connections, their skills, their experience and their people is incredibly useful."
The Māngai Māori initiative was a finalist in the Cultural Wellbeing category of the 2019 Local Government New Zealand (LGNZ) Excellence Awards.
Waikato District Council agreed last year to introduce Māngai Māori to three of its committees. Waipa District Council also announced last year two iwi representatives will sit on council's decision making committees this year.