Harri Sakari Vaalio (born 1956 in Järvelä, Kärkölä, Finland), also known by his artist name Wallu, is a Finnish cartoonist.
His other comics includes Hessu-kissa (1985–), Armas, also known as Lämsänperäläiset (1977–), and KyöPelit (1993–).
In the early 1980s he was a teacher in the local elementary school, now known as Vuokkoharjun ala-aste.
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