Officer Rowan O'Sullivan
Biographical information
Full name Rowan O'Sullivan
Gender Female
Status Alive
Birth 1984
Personal information
Nationality Flag of IrelandFlag of United States Irish-American
Residence Grimmslaught, U.S.
Belfast, Ireland (formerly)
Past profession(s) Ecologist
Family Unnamed father
Unnamed mother
Affiliation(s) Grimmslaught Police Department
Grimmslaught Police Department
Rank Officer
Game information
Appearance(s) Criminal Case (season 1)
Nobody notices your tears, pain, or sadness, but they notice all your mistakes.
—Rowan O'Sullivan

Officer Rowan O'Sullivan is a main character appearing in Season 1 of Criminal Case, where she serves as the Grimmslaught Police Department's Officer and the player's primary partner throughout the season.


Hailing from Belfast, Ireland, Rowan is a 32-year-old officer for the Grimmslaught Police Department who is assigned to be the partner for the player's career in the Grimmslaught Police Force and worked as an ecologist prior to her tenure in the department. She has long ginger hair in a bob hairstyle, bright blue eyes, and light lipstick on. She wears a red lavalliere shirt with dots that are slightly lighter than the shirt's background. Other than that, she always wears a ring pendant around her neck.

Rowan is known to be gloomy, sorrowful, and easily annoyed. She likes to read interesting facts, read gossip magazines, and to go ice skating. However, she has a weakness for pound cake. It is also known that Rowan's favorite animal is a red deer and her favorite food is Irish stew.



Rowan was an only child in her family and was loved until her father was laid off from his job. Her mother ran away and her father committed suicide, which led her to being alone for a prolonged period of time until she was a child begging on the streets. She, along with some other Irish orphans, had to manage being alone on the streets. She would later be a stowaway on a ship and come to Grimmslaught. She had a better future, but Rowan's horrible past would always haunt her. She often empathizes with people who have also gone through a great deal of pain. 

Notable Events of Criminal Case

Meeting Rowan

In the opening cutscene of the first case of Grimmslaught, Chief Campbell warmly welcomed the player to the Grimmslaught Police Force and introduced herself first. She then confirmed that Rowan was assigned to be the player's partner in their investigations. Olivia then decided to introduce Rowan to the player. Rowan appeared annoyed as she wanted to be a "solo detective", but she still gladly welcomed the player to the GPD and introduced herself. Shortly after, she said that she wanted to see how well the player could investigate. Rowan then suggested Rowan to kick things off by showing her new partner the local landmarks. Rowan then agreed and, to begin their journey, took the player to Main Street, where they found the victim of a brutal murder and soon began their first murder investigation together as a team.

Personal Life

Rowan was born in Belfast, Ireland and lives alone in an apartment.


The player may choose Rowan to join the investigation of each crime scene (in any Nyctochral case player) and provide hint bonuses. She is available as a 1-hint, level-10 partner.

Case Appearances

As one of the main characters and the player's partner in the Grimmslaught PD, Rowan appears in every single case of Grimmslaught.


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