Soka, daughter of Lizardman chieftain Abiru and younger sister of Gabiru, initially served as the Guard Captain of her tribe. During this role, she displayed green anthropomorphic lizard features, violet hair, light armor, and a yellow scarf. After being named by Rimuru, she evolved into a Dragonewt, adopting a more human-like appearance with the ability to conceal her red wings and horns—traits ideal for infiltration. Her typical attire resembles a ninja's: a red ninja dress, black and silver belt, medium black sleeves, bright sleeves, dark gray and red arm warmers, black short leggings, and dark gray boots.

Dutiful and serious about her responsibilities, Soka communicates concisely. She prioritizes the safety of her home and loved ones over personal pride. Unspoken romantic feelings for Souei motivated her evolution to join his intelligence unit, though her shyness and his disinterest in romance prevent her from confessing.

Her background includes defending the Lizardman Tribe during the Orc Invasion. Later, under her father's direction, she and her guard squad relocated to Rimuru’s city to broaden their skills. There, she became Souei’s mentee and joined his covert operations unit, eventually recruiting her former subordinates. She reconciled with the Orcs after recognizing their reformation under Geld.

In "The Slime Diaries," she displays comedic moments: intense embarrassment wearing a swimsuit despite its modesty compared to her regular outfit, and visible disdain when her father presents suitor profile pictures.

Soka appears in the main anime series as part of Souei’s unit, in "The Slime Diaries" spin-off focusing on Tempest’s daily life, and in the mobile game "ISEKAI Memories" interacting with citizens in the town’s eastern district.