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Danny Wright is the Idaho National Guard private at the center of Trent Reedy's Divided We Fall young adult political-thriller trilogy.

David Cavanaugh is the Boston criminal defense attorney in Sydney Bauer's six-book legal-thriller series.

Danny Cortez is the title character of Andre Gonzalez's action-thriller series, scheduled to begin with Dead Man's List in 2026.

Dylan Maples is the young lead of Shane Peacock's Canadian mystery adventures, with each case rooted in a different region's geography and history.

Daniel Marchant is the MI6 officer at the center of Jon Stock's three-book British espionage thriller series.

Darcy Merriweather is the wish-granting witch and amateur investigator in Heather Blake's nine-book Wishcraft Mysteries.

Danitra Brown is the self-possessed title character in Nikki Grimes's three children's poetry books about her friendship with Zuri Jackson.

Dyamonde Daniel is the candid third-grade lead of Nikki Grimes's early chapter books about friendship, money, disappointment, and self-respect.

Daniel Jacquot is Martin O'Brien's Chief Inspector of the Police Judiciaire, investigating crime across Provence in a ten-book series.

David Hunter is Simon Beckett's forensic anthropologist, using evidence from human remains to investigate crimes across a long-running thriller series.

Dr. Pippa Durrant is a forensic psychologist in Miranda Rijks's thriller trilogy whose training in detecting deception draws her into murder cases.

Darren Mathews is Attica Locke's Black Texas Ranger, investigating murder and disappearance cases across East Texas in the Highway 59 trilogy.

DI Duncan McCormack is a Highland detective working difficult cases in Liam McIlvanney's 1960s Glasgow crime novels.

Dan Hopper is Neil Sands's former paratrooper detective in the two-book Pursuit of Justice crime-thriller series.

Dixie Hemingway is a former sheriff's deputy working as a pet sitter on Siesta Key in Blaize Clement's Florida mystery series.

Deucalion is the original creature in Dean Koontz's Frankenstein novels, opposing Victor Helios and his plan to create engineered humans in New Orleans.

Dirk Pitt is a NUMA troubleshooter in Clive Cussler's long-running adventure novels, investigating maritime mysteries, lost history, and large-scale threats.