Tertiary consumers feed on heterotrophs since heterotrophs are secondary consumers, therefore tertiary consumers feed on those. It also depends on what kind of heterotroph one has.
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The Kingdom Animalia is made up of multicellular heterotrophs only. Organisms in this kingdom obtain their nutrients by consuming other organisms.
Protista
The kingdom that includes autotrophs, heterotrophs, unicellular, and multicellular organisms is the Kingdom Protista. This kingdom is a diverse group of eukaryotic organisms that do not fit neatly into the other major kingdoms.
Protista, of course.
The Fungi kingdom includes multicellular heterotrophic organisms.