Vodyanoi

Summary sources describe the vodyanoi as one of the suite of supernatural beings in Slavic religion and folklore and explicitly connect the figure to the Slavic root for water (voda). Encyclopedia-style entries and structured-data summaries classify the figure as a male water spirit or fairy-tale character and, in some descriptions (Wikidata), as a 'tutelary deity' for particular watery places; popular summaries place him alongside other localized spirits such as the domovoi, indicating a role within a wider ecosystem of place-spirits rather than a single unified origin narrative (Wikipedia; Wikidata; Supernatural beings in Slavic religion).

Popular visual and folkloric descriptions portray the vodyanoi as an often-male, amphibious old-man figure: a naked old man with a frog-like face, greenish beard, long hair, body covered in algae and muck and often with dark fish scales (Vasilyna Holod; Wikipedia). Other summary sources emphasize that he is 'cold' and 'wet' in demeanor; modern adaptations sometimes exaggerate or transform these traits (podcast blurb; Mythoi commentary; art description).

Encyclopedic sources present the vodyanoi as the animate presence or guardian of waterplaces (Wikipedia; Wikidata), while popular compilations emphasize harmful behaviors in some traditions, including drowning, abducting, or enslaving humans who encounter him in or near water (10 Dark Slavic Legends; Mythoi). Wikidata's label of 'tutelary deity' implies he can act protectively over a body of water or punitively toward those who offend it; sources vary between neutral and malevolent portrayals, and detailed lists of powers are not present in the provided materials (Wikidata; Wikipedia; 10 Dark Slavic Legends).