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These are various designs and appearances of Arnold throughout the franchise.
Outfits[]
Default outfit[]
Arnold with his yellow and white striped polo, jeans, and sneakers in the book era and 1990s era. In the books, he has blonde hair.
Arnold with his green sweater and dress shoes in the Rides Again era (design from Season 3 onward).
Field trip uniforms[]
Other outfits[]
Alternate forms[]
Flattened by Weatherman in "Kicks Up a Storm".
Liquefied by Weatherman in "Kicks Up a Storm".
Arnold as ice crystals in "Kicks Up a Storm".
Arnold, enlarged to intimidate the Tyrannosaurus rex in "The Busasaurus".
Arnold as a bat in "Going Batty".
Arnold as liquid water in "Wet All Over", The Magic School Bus At the Waterworks, and "Kicks Up a Storm".
Arnold evaporating as water in "Wet All Over".
Arnold as a cloud in "Wet All Over".
Arnold as a honeybee in "In a Beehive".
Arnold's reflection in "Gets a Bright Idea".
Arnold as the fetus of a salmon egg in "Goes Upstream".
Arnold as a newborn salmon in "Goes Upstream".
Arnold as an older salmon in "Goes Upstream".
Arnold as a mussel in "Goes to Mussel Beach".
Arnold as a fox in "In the City".
Arnold as a hermit in "Takes a Dive".
Arnold as a goby fish in "Takes a Dive".
Arnold as a shark in "Takes a Dive".
Arnold as Captain Rock Man in igneous form in "The Battle for Rock Mountain" and "In the Zone".
Arnold as Captain Rock Man in sedimentary form in "The Battle for Rock Mountain".
Arnold as Captain Rock Man in metamorphic form in "The Battle for Rock Mountain".
Arnold as a moth in "In the Zone".
Arnold as a clam in "In the Zone".
Arnold as an ammonite in "The Land Before Tim".
Arnold converted into data in "Nothin' but Net".
Arnold as a mushroom in "Pigs in the Wind".
Arnold as a tree in "Pigs in the Wind".
Ages[]
Infant ("Shows and Tells")
Elderly ("In the Zone") - voiced by Amos Crawley