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Although the original series had decent length at forty-three books and Crimebusters was cancelled after only hitting eleven books, the extended German release puts the books at
over two hundred. As a result, the series has amassed quite a cast of characters. The characters are sorted by which series they were part and when they debuted except for the Investigators and their family, who have their own pages.
Characters
- The Three Investigatorsnote Jupiter Jones, Peter Crenshaw, Bob Andrews
- The Trio's Familynote Mathilda Jones, Titus Jones, Julius and Catherine Jones, Abernathy Family, Henry Crenshaw, Mrs. Crenshaw, Bennington Peck, Shadow the Dog, John Andrews, Mrs. Andrews, Mary, Rosie Wrenrick, Brian and Ashlyn
- Original Seriesnote Worthington, Hector Sebastian, Hans and Konrad Schmidt, Samuel Reynolds, Skinner E. Norris, Blackbeard the Mynah Bird, Allie Jamison, Hoang Van Don, Carol Bennet, Patricia Osborne, Anna Schmidt, Victor Hugenay
- Crimebustersnote Ty Cassey, Kelly Madigan, Elizabeth Zapata, Lys de Kirk, Jeffery Palmer
- German Extended Releasenote Inspector Cotta, Jelena Charkova, Rubbish-George, Lesley Dimple, Callidae Detectives (Corona, Althena), Goodween, Clarissa Franklin, Inspector Kershaw, Dick Perry