| Description | Character |
| Demolition Worker | |
| Found a cat and named it 'Cupcake' | |
| Arnold's Crush | |
| Wore a backwards green hat | |
| Immigrant from Vietnam | |
| Injury prone boy | |
| The caring teacher | |
| Nerdy girl with a flower on her shirt | |
| Perfect daughter of Bob and Mariam | |
| Number thirty-three | |
| Cheated on a poetry contest | |
| Chosen spokesman for Yahoo drinks | |
| 5th grader bully | |
| Wore a tiny blue hat | |
| Heavy breather and stalker | |
| | Description | Character |
| Has a shrine of Arnold | |
| Unemployed Czechoslavakian who lives in Sunset Arms | |
| Answers his cellphone in class | |
| Class psychopath | |
| Never leaves his spot | |
| Pet pig | |
| Ill-tempered 6th grade girl | |
| Scottish girl who sells chocolate turtles | |
| Nicknamed 'Steely' | |
| Mysterious resident who never talks | |
| Rich fashonable girl | |
| 6th grade girl who 'dated' Arnold | |
| 6th grade girl who 'dated' Gerald | |
| Has six braids of blond hair | |
| Pookie | |
|