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Layton Detective Agency
The 22-year-old daughter of Prof. Hershel Layton, Katrielle opens a detective agency and will leave no mystery or puzzle unsolved.
A first-year student at Gressenheller university who also works as Katrielle's devoted assistant.
- Composite Character: He's essentially an amalgam of Luke and Emmy: a boyish, wide-eyed admirer of the protagonist (Luke) who was saved by her after being taken into Scotland Yard under false accusations (Emmy).
- Dogged Nice Guy: Is head over heels in love with Katrielle and would do anything for her, but has trouble actually voicing his affections strongly. Even after he was revealed to be the mastermind behind the game's main plot, his attraction and affection toward Kat were genuine.
- Have a Gay Old Time: Ernest's general way of speaking is super polite and prim, to the point of sounding both very young yet antiquated for a man his age. He actually even uses words like "gay" and "queer" as they were intended decades ago.
- House Husband: He's not married to Kat, but he essentially looks after the daily upkeep of her office for free, serves her tea, and is marked with more traditionally feminine interests like botany.
- Love at First Sight: Was enamored with Kat the first time he set his eyes on her. Her genius detective skills and bold, honest personality only made him fall for her even more.
- Nice Guy: Ernest doesn't have a mean bone in his body.
- Though he did have a mean mind, all that became null and void like the Diamond Mine.
- The Butler Did It: Ernest acts like a butler to Katrielle Layton and is Miles Richmond, the grandson of Maximillian Richmond, the mastermind in the final case.
- Undying Loyalty: To Katrielle.
Sherl O.C. Kholmes
Katrielle's first client, a talking dog. Cannot remember anything about his past.
A rising inspector in Scotland Yard, loved by the people of London for his passion to his duty.
- Book Dumb: Tends to have the hardest time with puzzles among the main cast.
- Slight subverted when he manages to solve some himself.
- Friend on the Force: Is Katrielle's main contact at Scotland Yard, and comes to her with cases too out of the ordinary for the police to handle.
- Happily Married: To his wife Felicity.
- Inspector Lestrade: Is often going down the wrong path on the cases in the game. However, this is more due to how bizarre and unusual the cases actually are.
- Technically slightly subverted in Case 08. While he was right in pointing out Abel Seamon being the culprit in stealing the Golden Goddess Statue, he did not know it was the entire crew of the Thametanic who were involved.
A master criminal profiler working at Scotland Yard. Sees Katrielle as a rival.
- The Ace: Is known around the Yard as "Perfect Perfetti" due to her outstanding success rate as a profiler.
- Gratuitous Italian: Given that she is Italian, she'll often thrown around an "allora" or "va bene."
- Guest-Star Party Member: Works with Kat during investigations on occasion, and even solves a few puzzles while with you.
- The Profiler
- The Rival: To Katrielle.
- Why Did It Have to Be Snakes?: Has a huge fear of ghosts; which makes case 05 rather difficult for her, since it investigates a haunting.
Chief Inspector Royall Britannias
The Chief Inspector for Scotland Yard, and a longtime friend of Inspector Hastings.
- Dirty Cop: While he may not be a murderer, he still manipulated the scene to look like a murder, framed Katrielle, and fully intended on putting her in jail for a crime she didn't commit, all so Hastings wouldn't outshine him.
- Good Is Not Nice: While he's definitely abrasive, he's still Scotland Yard's Chief Inspector, and lines from Hastings implies he was once nice enough to be a good friend. Subverted, as it turns out he was the one behind the murder in Case 11. Then Double Subverted, or at least downplayed, as he didn't actual commit murder, and merely seized the opportunity to frame Katrielle after an accident.
- Green-Eyed Monster: His jealousy of Hastings' recent success is what motivates him to frame Katrielle for murder.
- Walking Spoiler: The fact that he was behind the incidents in Case 11 is a majority of what we know about him. Admittedly, part of that is guessable as soon as he appears. The fact that he's not the murderer, however, then becomes one.
The Seven Dragons
Seven of London's wealthiest and most powerful.
Madame Gretchin Doublee
The business-focused Dragon. She is an enormous woman with wealth to match. Case 04 is dedicated to finding her lost Rexie-wexie.
Phineas T. Barnone
The entertainment-focused Dragon. He owns the Saveloy Theater. Case 03 is dedicated to finding a movie scene at his theater.
Mayor Pipper Lowonida
The politics-focused Dragon. She is the mayor of London, and also loves festivals. Case 02 is dedicated to solving a murder at her favorite festival.
- Peek-a-Bangs: Has long brown hair that curtains over one side of her face.
The media-focused Dragon. He owns the London Times. Case 07 is dedicated to finding local celebrity Ratman to boost sales.
- Alter Ego: Cesar is Ratman himself.
- Punny Name: Cesar Chance basically sounds like "Sees a Chance".
The social-focused Dragon. She's a lonely heiress. Case 05 is dedicated to investigating the supernatural phenomena at her manor.
- Lonely Rich Kid: Her parents had passed away recently, so she often only had her butler for company.
The finance-focused Dragon. He owns Britain's largest bank. Case 06 is dedicated to finding a missing 100,000,000 pounds.
- Face of a Thug: One of the most physically intimidating dragons.
- Punny Name: Grant Sloanes, owner of a bank, grants you loans.
The shipping-focused Dragon. He's launching the Thametanic cruise liner. Case 08 is dedicated to finding the lost gold statue from the lounge.
Other Important Characters
Lord Adamas (Warning! Many spoilers)
A mysterious man whose identity is a mystery to all. Case 12 involves him inviting Professor Layton
and the Seven Dragons to Richmond Manor for a puzzle party.
- Affably Evil: Well, Ambiguously Evil, admittedly, but he does intend to ruin the Dragons. However, he does give them a chance to solve the puzzles in the manor to earn their way out.
- Blatant Lies: It's fairly obvious by the signing that the whole party was just a charade to ruin the Dragons. By the end, it turns out even if they had somehow won, the Richmond Fortune doesn't even exist to be won.
- Easily Forgiven: Lampshaded. The Dragons completely forgive him for trying to ruin their lives over things they didn't even do. The fact that everyone around him told him they did might help explain it.
- Misplaced Retribution: By this point, it's fairly clear to the player that the Dragons are ultimately decent people, if sometimes a little misguided. They didn't even do what Adamas accused them of doing in the first place, almost doing the exact opposite.
- The Voice: He doesn't appear physically for his guests, instead speaking to them from elsewhere. As it turns out, there's a good reason for that.
- Walking Spoiler: More than any other character/villain in the game. He's Maximillian Richmond's grandson, Miles, who's pursuing the Dragons as revenge for cheating his grandfather out of a great fortune in diamonds. If that wasn't enough, he's also Ernest Greeves, the main character's assistant and deuteragonist for the whole game.