Arianna is a small, thin girl with ginger hair down to her shoulders with a white bow tied at the top of her head. She has pale skin and bright blue eyes. She wears a navy dress with a white lace collar tied up with a red ribbon. She also wears white tights and red and blue striped shoes with red ribbons.
Arianna is friendly and kind at heart, but tends to judge others very quickly. She has a short temper and doesn't care about what people think of her. She was very out-going and social until her father died, when she afterwards locked her self off from the rest of the world. She is very close to her brother Tony and is friends with Luke Triton. After realizing with the help from Professor Hershel Layton, Luke Triton, and Emmy Altava that the townspeople are kind, she become friends with many children her age.
She has a tendency to be blinded by her first impressions.
An unusual young girl who seems to harbor some secret.
A year prior to the events of Last Specter, Arianna's father died. His will was altered by Jakes, so that the land Evan owned was passed down to Clark Triton instead of Arianna. She and her brother Tony continued to live in Barde Manor alone, shooing away any townspeople who came to check on them, under the impression that they thought bad of them because of their father. The specter started appearing in Misthallery shortly after. To make matters worse, Arianna was suffering from an illness that threatened to end her life sooner than later. Tony became very protective of her because of these things and put a mark on the home of anyone who spoke ill of her, and when the specter came it would trash the house. This created the rumor that a calamity witch was living in Barde Mannor, and it spread like wildfire around Misthallery.
Because Tony never told her it was him behind the marks, Arianna started believing that she really was a calamity witch. She remained at the manor constantly, with only Tony and Loosha as company.
When Loosha tried to fight the specter, Arianna would play her ocarina into the pipes of the old water system around Misthallery to calm her down.
Chapter 5 : The witch's castleEdit
The three members Emmy, Luke and Layton headed to the Barde manor to meet Arianna. When they arrived at Arianna's room, Arianna meets Layton, Emmy and Luke face to face. Arianna didn't want to know the specter's flute and told them to go away. Arianna said that she is the witch. But, Luke said that she is not a witch. A flashback from a year ago before Evan Barde's death, Evan hosted a party. Arianna meets Luke at the balcony and they properly introduced themselves. After the flashback, Arianna told Luke that she's cursed. Luke tried to calm her down but none prevailed. Seamus arrived and kicked them out of Arianna's room.
Later, when they arrived at the manor, Layton and co. met Arianna and Seamus at the lake. Layton said to her that she is not cursed because the calamity witch is a myth and he said it is created to protect her - and the person is none other than Seamus. Seamus revealed himself as Arianna's younger brother, Tony. He couldn't forgive the townspeople who said mean things about her. The three are looking for the specter's flute. Luke tried to calm her down. But again, she told them to leave.
Chapter 9 : The specter becomes clearEdit
The company met Arianna and Tony at the lake. Layton worked out of what the specter is and who is controlling the flute. Arianna plays the melody and summons a sea creature, Loosha. Arianna told them the flute she played calms Loosha down. Jakes and his men captured Loosha as he thought the specter to be a dinosaur, and captured Arianna and Loosha.
Chapter 10 : The legend revealedEdit
Layton and co. were about to save Loosha and Arianna from Jakes and his men. Before that, Layton splits up Emmy and Luke to save Brenda, Luke's mother. At the Grand Plaza, Arianna told Jakes that Loosha didn't do anything. Layton arrived and told Jakes the proof about the real specter. Layton presents the townspeople the real specter. Luke tells the specter it's an excavating machine to find the golden garden. Layton finds the culprit who is responsible for the incident and the culprit is the fake Doland Noble. Doland revealed that he is Jean Descole. Descole starts rampaging the town causing the people of Misthallery to run scared. Loosha was in a struggle, battling with the specter. The three were close to stopping the specter. Layton receives the catapult from the Black Ravens. Emmy pulled the wires and Luke leads Loosha to the other side. Layton built the catapult and defeated the specter, but not for long. The specter rebuilt itself and attacked the three. Loosha was about to break the dam. Crow noticed and helped the Black Ravens break the floodgate. While they battled on, the three heard the flooding sound. The flood destroyed the specter. Layton, Emmy, and Tony, including Arianna and Luke, praised Loosha.
Epilogue : The last giftEdit
Loosha was about to break the main dam of Misthallery. Arianna tried to attract attention by playing the flute but nothing happened. Loosha said to Luke that there was no time. Loosha breaks the dam causing Misthallery to flood the place again. Loosha guided the company to the secret gate. They opened the gate and they find the Golden Garden. Meanwhile, at the Golden Garden, Loosha dies from wounds during the final battle. Arianna and Tony tried to comfort her, but to no avail. The Barde siblings cried over Loosha's death. Luke said Loosha used the last of her strength to bring her to this wonderful place. Luke understands Loosha's last words - she said, thank you to both of them. This caused Arianna to break down in tears. Luke told Arianna that she'll open up to people again when she feels better, and because Loosha wanted her to be happy again. Luke said Loosha was the last of her kind. But Loosha was not lonely when she was with Arianna, and that's why she told them "thank you". Arianna said "thank you" to Loosha in turn, and she played the final song as a tribute to Loosha.
A few days later after discovering the Golden Garden, Luke and his family were moving out to London. Luke was about to say goodbye to his friends including Arianna. Arianna thanked him. The townspeople befriended Arianna. Before leaving, Arianna gives Luke a goodbye kiss on the cheek, and they sincerely agreed to see each other again. After that, the Tritons leaves Misthallery for London.
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- Luke is 10 years old in Last Specter while Arianna is 11. While this could result in a 1-year age gap between them during the events of the game, it should be noted Luke's exact birthday is also unknown, as was Arianna's; so he could have also been anywhere from 10~11 (10 going on 11). In Miracle Mask, the sequel to Last Specter, he is 11.
- As Emmy says in Last Specter, a year after the events of the game, Arianna fully recovered from her illness.
- Barde is a term that refers to horse armor that was used in the feudal Germanic Kingdoms of Europe during the Medieval Era.
- In the last clip in Last Specter, Arianna gives Luke a goodbye kiss on the cheek and they agreed to see each other again. (Despite this, in the Layton Mystery Detective Agency: Kat's Mystery-Solving Files anime, Luke briefly returned to reunite with Layton after "10 years" with a partner; Marina. Layton himself would then vanish after, and Luke's own status as well as Arianna's own remains unknown.) Her age as of the anime and the Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy game (which debuted before the anime) would be around the age of 33-35+ years of age (if going by Luke's estimated age at the end of Unwound Future and the anime), with around one additional year to Luke's age likely added.