The simplest way to describe Slinkachu is as a London-based artist who creates very small street-based installations and then photographs them: from far away and up-close.
He could also be described as a miniaturist. He modifies tiny human figurines from model train sets and places them in real urban situations, capturing them sight-seeing, camping, grocery shopping, fighting and dying. A tiny man in a suit holds a spent life-sized matchstick and gazes at his now scorched car (called "Company Car"). A miniature man holding a rifle, who has seemingly just shot a life-sized bee, says to his crouching daughter, "They're not pets, Susan." 
In contrast to the propaganda posters of Shepard Fairey or the subversive stencils of Banksy, Slinkachu's approach to street art is more subtle, more sensitive. You could easily walk right past one of Slinkachu's installations and not know it's there. His photographs are key: the close-ups make you feel like a participant, while the far-away shots leave you feeling like a spectator.