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|The characters and/or events depicted in this article belong to an alternate timeline or dimension.|
|Home World||Earth (alternate timeline)|
|Voice Actor||Richard Horvitz|
|First Appearance||Goodbye and Good Riddance|
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.
- 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.