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Robbie comúnmente se representa con un atuendo similar al de Gravity Falls Wendy. Viste franela verde, camisa blanca, jeans ajustados y botas sucias. Algún fanart muestra a Robbie en un traje gris y blanco con gafas. En ambos, su cabello es más corto y no cubre su ojo
Robbie's personality differs with the way he was drawn. While in his Wendy-like outfit, he seems more laid back, and a lot more shy. But, when's he's dressed smart in his suit and glasses, Robbie is stiff, smart, and judgy. He seems to work for Gideon Pines because in one drawing he's checking out Journal 3.