Emily | Nathan | The Dog | James | Grandma | James | Maddie | Roger | Mr Walnuss | Mrs Prozack | Monkey
- Emily: The bossy five-year-old kid sister.
- Nathan: Know-it-all boy engineer.
- The Dog: Loyal friend to Emily.
- Emily and Nathan’s Grandma: A sole voice of reason and authority.
- James: Nathan’s sad pal.
- Maddie: Nathan’s rival.
- Roger: The cool kid, quite possibly the real ‘villain’ of the strip.
- Mr Walnuss and Mrs Prozack: Faculty members at Nikola Tesla High School.
- Various Non-sentient Robots (This is a webcomic, after all. You gotta have robots.)
- A Monkey (Or possibly a small ape.)