|Characters and/or events depicted in this article are a what-if? version and are Non-Canon|
Arnold is a male student who goes to Madison Elementary School.
He wears red glasses and has brown eyes. He is chubby and short and has orange, short hair.
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- Goodbye and Good Riddance (first appearance)
Arnold shares his first name with Arnold Perlstein from The Magic School Bus series, who also has glasses and orange hair.
- He has a blog about the alien sightings, much like Jimmy Jones.