|Game||Tales of Hearts|
|Height||5'2" / 158 cm|
|Weight||99 lbs / 45 kg|
|Japanese Voice Actor||Marina Inoue|
|Character Designer||Mutsumi Inomata|
Kohaku is a girl setting off from her home town in need of Soma, along with her older brother, Hisui Hearts. At the beginning of the story, they are chased by Incarose, but she saves them by pushing Hisui and herself off of the cliff before Incarose's energy beam hits them. Later, Kor Meteor finds them collapsed on the beach. While giving explanations, Kohaku refers to Incarose as "her". She is the owner of the Soma Elrond (エルロンド erurondo?). During the events of the story, she develops a love interest on Kor and shows a real trust toward him.
Kohaku's weapon does not change through the story. Even from the process of Soma Evolve, it will not change forms during battle. However, upon reaching its final Soma evolution, the weapon will change into one of two forms that affect its appearance during battle, depending which Soma Evolve path the player chooses. Both of these options are considered Kohaku's ultimate weapons. Kohaku fights by using a mix of martial arts and Fire, Wind, and Light magic, though she is mainly of the Fire element. She can act as a decent healer, though that role is generally filled by Hisui. Her Combination Blaster is Satsugeki Bukouken, which consists of a mixture of many of her artes, finishing with a cherry blossom kick.
Tales of Graces
Kohaku's name is localized as Amber Hearts in Tales of Graces. She appears as a cameo boss, along with Veigue Lungberg from Tales of Rebirth and Reala from Tales of Destiny 2. In order to fight her alongside the other Tales characters, she must first be defeated in the Zhonecage. Then, the player must find her "missing precious item", an anklet, which she later reveals to be a Soma that is very important to her.
- Kohaku's name refers to the gemstone amber, known in Japanese as "kohaku" (琥珀?), which is the basis of her localized name of "Amber" in Tales of Graces ƒ.
- Kohaku's fear of heights stems from the time in her childhood when she fell out of a window.
- Kohaku's "Legacy" costume in Tales of Hearts R is based on Marta Lualdi's appearance from Tales of Symphonia: Dawn of the New World.