Nils was born in Onso Oct 1854 and came to South Australia about 1885. I am searching for his emigration information - ship, arrival date. He is listed on Norway 1865 and 1875 Census - in 1885 listed as seaman.
Here is his profile in s Fredrikstad sailors' roll. The last entry is from 1891, unfortunately hard to decipher. There is also something about jumping ship (rømt) in Dublin in 1879.
Nils Petter Emil Kristiansen applied for citizenship in Australia in 1892 and stated he had been living in South Australia for 7 years so his arrival must be around 1885.
Well using the information from Tore as well your original and later information, here are the arrivals I find on Ancestry.com.
Niels Christiansen in the Queensland, Australia, Immigration Indexes, 1848-1972 Name Niels Christiansen Age 27 Birth Year abt 1856 Arrival Date 4 Dec 1883 Arrival Place Queensland, Australia Ship Almora Description "Passenger Lists of Immigrant Ships With Departure and Arrival Dates and Ports, Surgeons and Masters on Board and Types of Passage; Includes Links to Scans of the Registers" Page number 515 File Number S13086 Item ID 18480 Microfilm Number Z1961 Item ID Source https://www.archivessearch.qld.gov.au/api/download_file/DR37834 Index Name Assisted Immigration 1848-1912
Same name and same year and same ship different birth year so perhaps the same person or perhaps not?
Niels Christiansen in the Queensland, Australia, Passenger Lists, 1848-1912 Name Nels Christensen Age 26 Birth Year abt 1858 Ship Name Waroonga Port of Departure Plymouth, England Port of Arrival Cooktown Arrival Date 8 Jan 1884
Nils Christiansen in the Queensland, Australia, Immigration Indexes, 1848-1972 Name Nils Christiansen Age 25 Birth Year abt 1854 Arrival Date 7 Feb 1879 Arrival Place Queensland, Australia Ship Fritz Reuter Description "Passenger Lists of Immigrant Ships With Departure and Arrival Dates and Ports, Surgeons and Masters on Board and Types of Passage; Includes Links to Scans of the Registers" Page number 205 File Number S13086 Item ID 18478 Microfilm Number Z1959 Item ID Source https://www.archivessearch.qld.gov.au/api/download_file/DR38473 Index Name Assisted Immigration 1848-1912
I could find more candidates fairly easily but there is not a good way to sort out the right person from any another candidate who would not be the right guy.
Immigration to Australia in February of '91 seems too early. The date of jumping ship in Dublin is given as i/4 79. Despite the mysterious "i", I take this to be some time in April, since all dates are written in the day/month format.
There are two entries for dates in '91. The first is 25/7. I can't read everything here, but judging from some of the words it COULD be about paying a fine of 10 kroner for having lost his sailor's patent. The other date is 11/8. The text here looks like it could be "anmeldt at reise til Utlandet for at fare derfra"; declared to travel abroad to sail from there.
The reason many Norwegian sailors jumped ship, was the difference in pay; British and American ships often paid quite a bit more.