how is it classified?
It meets the classification whether it "looks" like a planet.
Pluto
There are two primary definitions of 'planet'. Disregarding the often inconsistent technical details, they are whether a body "acts" like a planet (e.g. its orbit and relationship to other bodies) or whether it "looks" like a planet (e.g. whether it has planetary geology). Pluto meets the second definition but not the first.
what is pluto? A dwarf planet in the Kuiper belt. who discovered it? Clyde Tombaugh when? 1930 what is its origin? One early hypothesis was that Pluto was an escaped moon of Neptune. what is its mass? 17.7% that of the Moon. what is its size? Its surface area is , or roughly the same surface area as Russia. what kind of atmosphere does it have? It has a tenuous atmosphere consisting of nitrogen (N), methane (CH), and carbon monoxide (CO). does it have a moon? UNANSWERABLE does it have a relation with any other planet? Yes, with Neptune. what kind? Pluto is protected by its 2:3 orbital resonance with Neptune. does it have a solid surface? UNANSWERABLE
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Pluto [SEP] Classification
There are two primary definitions of 'planet'. Disregarding the often inconsistent technical details, they are whether a body "acts" like a planet (e.g. its orbit and relationship to other bodies) or whether it "looks" like a planet (e.g. whether it has planetary geology). Pluto meets the second definition but not the first. From 1992 onward, many bodies were discovered orbiting in the same volume as Pluto, showing that Pluto is part of a population of objects called the Kuiper belt. This made its official status as a planet controversial, with many questioning whether Pluto should be considered together with or separately from its surrounding population.