Otso

Sources present multiple traditional accounts for Otso's origin. In some stories Ukko, the weather god, is said to have thrown bits of wool into the sea; Otso was born from the bits of wool that reached shore. Other variants place Otso's birth in the heavens, tracing the bear to the Ursa Major constellation. Ancient myths also describe a primordial kinship between Otso and humanity through the marriage of Otso and the primordial mother of men (Hongotar), a relationship which is ritually reenacted in the Peijaiset rite and underpins the idea that the bear's spirit is recycled into the world.

The sources characterize Otso primarily as a bear and as a collective animistic spirit rather than an individuated being. Otso is described as the sacred king of animals and leader of the forest; beyond that titular and social description the available texts do not provide detailed physical attributes, sizes, colors, or anthropomorphic features. The concept is expressed through a set of alternative names (Karhu, Ohto, Kontio, Mesikämmen) used across Finnish place and ritual language.

Rather than a catalogue of explicit magical feats, Otso's agency is expressed through cultural and cosmological roles: it is venerated and feared, occupies a central quasi-royal position among non-human beings, and features in origin and reincarnation narratives. Myths recount that Otso has many wives and children and is paradoxically described as sometimes eating them, pointing to an ambivalent relation of kinship and danger. Through the Peijaiset ritual the bear's spirit is ritually married back into its family and prepared to return to earth and reincarnate, indicating Otso's participation in cycles of life, death, and social reciprocity. Sources do not enumerate powers such as shapechanging or speech beyond the ritualized dialogue performed in Peijaiset between the killed bear and Hongotar.