A politician who believes in stigmata and thinks Donald Trump was "anointed" by God could have the most to gain from the Mt Roskill by-election on Saturday.

Labour's Michael Wood and National's Parmjeet Parmar will vie for the seat recently vacated by new Auckland mayor and Labour stalwart Phil Goff.

If Wood wins the seat, party numbers will remain unchanged in Parliament.

However, Parmar is already a list MP - so a win for her as an electorate MP means the next National list MP also enters Parliament. She is Mangere's Misa Fia Turner.

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Turner is number 53 on National's list and the only female National candidate to miss out in the 2014 election.

She was thrashed by Labour incumbent Su'a William Sio in the Mangere electorate and narrowly missed a spot as a list MP after special votes were counted.

Little has been written about Turner. She was the subject of a minor scandal in 2014 when it was alleged she had not earned the Samoan chief title 'Misa'.

Also in 2014, she told the Catholic website CathNews that gay marriage is "really against our moral values".

Turner did not respond to phone calls on Tuesday or Wednesday.

However, she is active on social media, where she lists her interests as praying, reading and networking.

Turner was born in Samoa and has lived in Mangere for nearly 20 years.

She runs a private counselling practice and has just finished a nine-year stint with the Genesis Youth Trust, which provides therapy and family services for at-risk youth.

Turner also seems to be a fan of United States president-elect Donald Trump, who she refers to as "anointed [by God] for an assignment".

She has also posted about a young Samoan woman who claimed to suffer from stigmata, writing: "If God can use a donkey, then He can use anyone as He pleases."

"I say Hallelujah and praise the Lord for His most humble servant, who is willing to identify with the suffering of Jesus Christ," she wrote.

National Party president Peter Goodfellow backed Turner and her beliefs as being suitable for Parliament.

In a statement, he said: "While Labour likes to attack people based on Chinese sounding names or exclude people with proud religious beliefs, like a lot of our friends in the Pacific community, National welcomes people of all ethnicities and cultures."