In a large bowl, whisk together vinegar, oil, matcha, and salt. Stir in rice. Taste and season with more salt to taste if necessary.
Spread the rice over a cling wrap and place 3 olives, walnuts, 5 goji berries, and parsley in the center. Wrap up into a ball.
Cut a thin strip from a nori sheet and divide it into 1 long and 3 short strips for mouth. Cut a zigzag pattern on the long edge of the remaining nori sheet for the front hair design and give 2 cuts on the other long edge to fit the curve of the rice balls. Slice a remaining olive and goji berry. Stuff the sliced goji berries in the center of the sliced olives to make eyes. Decorate the face with nori and olive eyes. Wrap in cling wrap to help the nori sheet soften.
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Notes
Please note that the nutritional information provided is just an estimate and accuracy is not guaranteed.