A Study in Regret/Characters

Sherlock Holmes

 * Distressed Dude: Those "drug and torture references" refer to somebody...
 * Love Hurts
 * Mr. Fanservice: With enough delicious angst to satisfy any Holmes Fan Girl.
 * Must Have Caffeine
 * My God What Have I Done
 * Not So Stoic: Holmes's infamous stoicism is pretty much hurled it out the window.
 * Protagonist
 * Tears of Remorse: Whenever Holmes cries, it's for Watson.

Inspector Geoffrey Lestrade

 * Adorkable
 * Beware the Nice Ones
 * Deadpan Snarker
 * Determinator
 * Deuteragonist: From recurring character in the Canon to The Hero of the story!
 * Fandom Nod: The use of the given name "Geoffrey" for Lestrade, an increasingly popular practice which began with Aragonite.
 * The Leader: Type II.
 * Not So Stoic
 * Only Sane Man
 * Reasonable Authority Figure
 * Team Dad

Mary Watson neé Morstan

 * Action Girl
 * Determinator
 * The Heart
 * Hypercompetent Sidekick: To Lestrade - Mary is shown to be easily as smart as the Inspector, if not smarter.
 * Like Brother and Sister: With Lestrade early on and Holmes later in the story.
 * Love Hurts
 * Multilingual Bonus
 * Pint Sized Powerhouse: Lestrade may be The Hero, but he and the other male characters make it clear that they know who's really in charge, here!
 * The Smart Girl
 * The Smurfette Principle
 * Team Mom

Marcel Bernier

 * The Atoner
 * Unwitting Pawn

John H. Watson, M.D.

 * Killed Off for Real

Colonel Sebastian Moran

 * Authority Equals Asskicking: In the Canon, Professor Moriarty hired Moran for his skills, and Moran proves himself to be downright terrifying.
 * Big Bad: Not bad for an Ascended Dragon Extra.
 * Cold Sniper
 * Hero Killer: He murdered Watson.

Briggs

 * The Dragon

Hannah Bessner

 * The Atoner: For her stepfather, Joubert.