Gabiru began as prince of the Lizardman tribe in the Great Jura Forest, serving under his father, Chieftain Abiru. When the Orc Lord threatened, external manipulations spurred him to instigate a rebellion, urging the Lizardmen to confront the danger alone. This choice caused major internal strife, leading to his exile as he accepted responsibility for endangering his people. Despite banishment, loyal followers and his younger sister, Souka, chose to accompany him. Initially marked by extreme overconfidence and a craving for praise, his personality was boastful and easily swayed by flattery or manipulation, contributing to his poor judgment and rebellion. Yet, beneath this lay a core loyalty to his followers and tribe. He demonstrated genuine humility in accepting full blame during exile, prioritizing his men's safety over his own. While energetic and prone to theatrical displays—frequently exclaiming "Ta-da!"—he also showed capacity for growth, gradually developing into a more reliable leader. Comedic tendencies, like forgetting he could fly after evolving, remained consistent. Following exile, Gabiru's group sought refuge within Rimuru Tempest's burgeoning forest nation, marking his significant development. Receiving a name from Rimuru catalyzed his evolution from Lizardman to Dragonewt, altering his appearance to feature purple scales, larger horns, and dragon-like wings he could conceal. He steadily integrated into the Jura Tempest Federation's society, ascending to military leadership as commander of the Flying Dragon Corps (Third Corps/Blue Army), overseeing aerial defense using wyverns. Concurrently, he aided civil efforts, collaborating with Vesta in the research department to develop healing potions from hippokute herbs. His journey involved overcoming initial prejudices against other monsters, solidifying loyalty to Rimuru, and earning recognition as a key executive and later one of the Twelve Guardian Lords. Gabiru's evolution continued significantly. He awakened as a True Dragonewt, attaining the title "Heavenly Dragon King," which unlocked substantially increased combat capabilities. His core abilities centered on the powerful inherited Vortex Spear. He possessed the Unique Skill "Showoff," enabling destiny manipulation once daily. Further evolution granted "Dragon Warrior Form," enhancing physical attributes and healing. His final awakening bestowed the Ultimate Gift "King of Moods," providing advanced capabilities: accelerated thought processing, fate manipulation, control over unexpected events, spatial manipulation, and generating multiple defensive barriers. His power level was quantified at EP 1,263,824, augmented by an additional 1,000,000 when wielding the Vortex Spear. Key relationships defined his path. His sister, Souka, maintained a close though often bickering bond, frequently acting as his minder. Loyal followers consistently supported him, their admiration persisting after exile. Deep respect for Rimuru Tempest grew after Rimuru saved his life and offered redemption. He also formed a productive friendship with Vesta through collaborative research. Trivia notes include the likely origin of his name from the Gavial crocodile. His ability to conceal wings after evolution explains their frequent absence in illustrations. A notable comedic incident involved him nearly provoking conflict by carelessly using the term "Hero" near the demon lord Milim Nava.