Based on the language list metafunctor is Finnish, so the only language standing out is Japanese. Finnish and Swedish are first and second languages (or vice versa). English and German are typical third and fourth school languages and Japanese is most likely something picked up in college.

Metafunctor: how did I do? :)

Spot on – looks like you're intimately familiar with the Finnish school system yourself. Are you Finnish?

Finnish (mother tongue), English (almost pass of as a native speaker), Swedish (get by), German (basics), Japanese (basics). The last two I'm rapidly forgetting, though.