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Reason #1
His design is based off Meowstic, the developer of Oneshot even said that himself.
Reason #2
There are loads of cat pokemon and Niko looks like a pokemon.
Reason #3
Niko loves pancakes, illustrated in picrel and pancakes are canon to pokemon as seen with Alolan Raichu's anime appearances.
Reason #4
Niko had to save the world with your help by controlling him just like how your pokemon always beat the evil team leader and save the region with your help controlling them.
With all this I've come to the conclusion that Niko is a pokemon, one of the best pokemon at that.
