Other signs included Nadeko from the Monogatari series, Uzaki from the upcoming Uzaki-Chan Wants to Hang Out! anime series, and more.
The above tweet, as well as many others, show the signs of encouragement (or discouragement in Kyubey’s case) left by the current students of Kyoto University.
He also runs the YouTube channel about Japan stuff called TheDoctorDazza, tweets at @DoctorDazza and posts photos of his travels on Instagram.