Thanks to Harry's Inky form he has the ability to shapeshift into different species to blend in more easily, some examples include becoming a Cat, Kobold or TV Head, other times more unusual things such as a Pokemon or a Mobian. and of course more simpler shapes such as an Enderman, but regardless of what form he might take it's easy to identify him by three factors: His lack of a mouth by hidding it, a red bowtie, and white/gray eyes.