Solosis is a round, green Pokémon surrounded by a darker green, gel-like substance. This liquid covering allows Solosis to live under any conditions. Its inner body has dark, oval eyes and a red diamond-shaped mouth. On the upper left side of its head is a curly, yellow growth that resembles the endoplasmic reticulum of a cell. It uses psychic powers to communicate with telepathy, as well as to drive away potential threats.
Solosis and Gothita's evolution branch can be considered parallel. Both are Generation V Pokémon evolving once at level 32 then at level 41. Solosis' family branch can only be found in Pokémon White, Pokémon White 2 and Pokémon Shield, while Gothita can only be found in Pokémon Black, Pokémon Black 2 and Pokémon Sword. They are both Psychic-type Pokémon with similar base experience and catch rates, they gain new moves at similar levels, and they have base stat totals of 290.
Solosis and the rest of its evolutionary line seem to bear reference to cells, with the head representing the nucleus, the green substance surrounding their bodies resembling cytoplasm and the objects inside their bodies representing organelles. The line down its head also resembles a cleavage furrow in cell biology. It may also make allusion to the embryonary stages, specifically the stage of morula.
Solosis may be a combination of solo (singular) and meiosis or mitosis (cell division).
Uniran may be a combination of uni (prefix meaning one) and 卵 ran (spawn). It may also refer to se unirán (Spanish for "they will join together"), as Solosis appears to be made of two parts.