Linze Silhoueska is the younger twin sister of Elze Silhoueska. After their parents' deaths, the twins lived with their uncle Joseph and aunt Rana in Collete Town, Refreese Imperium, near the Kingdom of Belfast border. They resided there until age 12, then began undertaking Adventurers Guild quests for support. Around age 13, while delivering a crystal antler to Reflet Town, they were nearly swindled. Touya Mochizuki intervened, shattered the antler, confronted the scammers, and paid the twins a gold coin. This encounter led them to stay together at the Silver Moon inn and register at the Reflet Town Adventurers Guild. Their first quest involved hunting lone-horned wolves in the East Forest, where Linze utilized her Fire Magic. Afterwards, at the Parent cafe, Touya requested Linze teach him the local alphabet, writing, and magic. During instruction, Linze discovered Touya possessed an unprecedented aptitude for all magic attributes, including Null Magic. Later, she assisted Touya and cafe owner Aer in creating ice cream using her Ice Magic, a sub-category of Water Magic, based on a recipe from Touya's smartphone.

Linze exhibits a reserved, prudish, and shy personality, contrasting with her more candid sister. Despite her bashfulness, she speaks decisively when necessary. This trait, particularly when angry, led Touya to regard her as the most intimidating among his wives. She demonstrates greater intellectual capability than Elze. Initially insecure about her femininity, especially her physical appearance and smaller breast size compared to her sister, she gained confidence through her relationship with Touya. She is easily flustered by romantic or unexpected situations involving him.

Linze has green eyes and silver hair cut to neck length, typically adorned with a purple and white bow. Her standard attire includes a green skirt featuring a green bow on the small of her back and the astrological symbol of Neptune. Underneath, she wears a long-sleeved purple shirt with a white center, paired with purple and white tights. Her footwear consists of white knee-length boots with purple foot areas. She accessorizes with a turquoise necktie secured by a metal clip shaped like Neptune's symbol near her neck.

Linze possesses magical aptitude in fire, water, and light attributes. She exhibits proficiency with Fire Magic but struggles with Light Magic applications. Unlike Elze, she initially lacked affinity for Null Magic. After receiving an engagement ring from Touya, she gained the ability to utilize specific Null Magic spells: 【Accel】, 【Storage】, and 【Transfer】. Her expertise in magical theory and discipline surpasses Touya's. Her equipment evolved from a silver wand purchased from Eight Bears Weapon Shop. Later, Touya provided her with a dragon horn revolver handgun modeled after a Smith & Wesson M36, notable for its lightweight durability. For ammunition, she used rubber-coated silver bullets enchanted with 【Paralyze】 Null Magic and later phrasium crystal bullets enchanted with 「Explosion」. She also wielded a mithril magic cane embedded with three magic stones corresponding to her elemental affinities. Her Frame Gear, an aerial-combat unit named Helmwige, served as her exclusive mechanized armor. She received two significant rings: an engagement ring from Touya, made of platinum with a diamond and enchanted with 【Accel】, 【Storage】, and 【Transfer】, worn on a mithril chain as a necklace; and a sacred platinum gold ring from the World God as a wedding gift, functioning as a receiver for Touya's divine power.

Linze married Touya Mochizuki and resides with him in the Brunhild Dukedom. In some continuities, such as the Tales of the Player series, she is known as Linze Aizawa or Linze Mochizuki, residing with Touya's reincarnation, Austin Aizawa. She was the first of Touya's fiancées to share a kiss with him.