True Finns Party is difficult to place in the political spectrum. It has its roots in the rural area party (e.g. farmers etc), combined with some anti-rich tax-the-rich rhetoric. Its supporters and some elected party members oppose mass-immigration, but the head of party has been silent about immigration. Party opposes gay marriage.
It is EU skeptic, but not totally opposed.
From US perspective, it is partly populist, partly conservative, partly leftist party.
Finland has multi-party system. True Finns has good chance of getting into the coalition government, but zero chance of significantly affecting Finland’s position in any important matter.
Unless Finns get so unhappy with the EU that True Finns gets elected to a parliamentary majority.
>> it is partly populist, partly conservative, partly leftist party <<
In other words, a perfect fit for Donald Trump!