| 100% | OPAL | 4 | Aunt in the "Judy Moody" book series |
| 57% | TIKTOK | 6 | Robot character in the Oz book series |
| 51% | POTTERS | 7 | Harry, Lily and James are these in the book series |
| 51% | SPOT | 4 | Dog in the "Dick and Jane" children's book series |
| 51% | LPS | 3 | They’re profiled in the 33 1/3 book series |
| 51% | ECLIPSE | 7 | Third book in the "Twilight" series |
| 50% | TIMMY | 5 | Dog in The Famous Five children's book series by Enid Blyton |
| 50% | WIMPY | 5 | Meek, as in the title of a "Diary" series of kids' books |
| 49% | WHERESWALDO | 11 | Popular children's book series ... whose protagonist is "hiding" in the circled letters |
| 49% | NATE | 4 | ___ the Great (detective in a series of children's books) |
| 48% | ELROY | 5 | Judy's brother in The Jetsons cartoon series |
| 48% | AGE | 3 | "___ of Reptiles," Ricardo Delgado's comic book series which is set in the Mesozoic era |
| 48% | SNOWY | 5 | English name of Milou, white fox terrier in The Adventures of Tintin comic book series |
| 48% | TOTO | 4 | Dog belonging to Dorothy Gale in the Oz series of books by L Frank Baum |
| 47% | BABAR | 5 | "King of the elephants" in a series of children's books |
| 47% | DAILYPLANET | 11 | Metropolis-based newspaper in the Superman comic book series |
| 46% | SODOR | 5 | Fictional island in the Irish Sea; setting for The Railway Series books by the Rev W Awdry |
| 46% | ARNIE | 5 | Name of the titular anthropomorphic doughnut in a series of kid-lit books |
| 46% | ISAAC | 5 | Big name in the ''Giants of Science ''book series |
| 45% | CALLA | 5 | Stephen King's fifth book in his The Dark Tower series: "Wolves of the ___" |
| 45% | DEFIANT | 7 | Final book in the 10-Across series by 24-Across/40-Across |
| 45% | STARSIGHT | 9 | Second book in the 10-Across series by 24-Across/40-Across |
| 45% | GOT | 3 | First book in the series "A Song of Ice and Fire," familiarly |
| 45% | DOWD | 4 | Ann —, actress who plays Aunt Lydia in US television drama series The Handmaid’s Tale |
| 44% | LISTED | 6 | In the phone book |
| 44% | THEBORROWERS | 12 | & 15A 1959 children’s book by Mary Norton; third in a series featuring the Clock family |
| 44% | SPECTRE | 7 | 24th film in the James Bond series |
| 44% | ASTRO | 5 | Dodger opponent in the 2017 World Series |
| 44% | VOLDEMORT | 9 | Main antagonist in the Harry Potter series |