United Future leader Peter Dunne says he plans to use his power in Parliament to moderate potential extremism in the new Government.
Mr Dunne is the party's only MP in Parliament, having won his electorate seat of Ohariu.
But with United Future winning less than 1% of the party vote, it loses Judy Turner. Its other MP from 2005, Gordon Copeland, contested the election under the Kiwi Party banner.
Mr Dunne says some people are concerned the new Government will swing too far to the right, but he hopes to prevent that.
Mr Dunne is likely to form a coalition with National and the ACT Party.