Gabiru began as prince of the lizardman tribe in the Great Jura Forest marshes. Son of Chief Abiru, he became the tribe's first named warrior, breeding overconfidence from constant praise. This arrogance left him vulnerable to manipulation by agent Gelmud, who goaded him into rebelling against his father during the Orc Lord crisis. Convinced seizing leadership would grant independence, Gabiru instead endangered his tribe. Upon recognizing Gelmud's betrayal and his own error, he accepted responsibility for his treason. Exiled by Abiru, he departed with loyal followers and his sister Souka—a pivotal turning point. Seeking refuge in Rimuru Tempest's nascent nation, Gabiru and his group earned Rimuru's recognition, receiving new names that evolved them from lizardmen to dragonewts. Gabiru gained dragon-like wings, larger horns, firmer scales, and a shift from greenish-black to purple. Later, during Rimuru's Harvest Festival, he transformed further into a true dragonewt, his scales turning reddish and horns growing more magnificent, symbolizing profound growth and integration into Tempest. Initially brash, egotistical, and impulsive, Gabiru boasted incessantly, craved admiration, and scorned non-lizardman races. His flawed judgment and susceptibility to flattery caused the rebellion's failure. Exile and facing consequences during the Orc Lord crisis forged humility, grace under pressure, and a willingness to shoulder blame for his men. In Tempest, he matured into a cooler-headed, responsible leader with knightly bearing. Though retaining eccentric quirks and occasional over-the-top enthusiasm, his core values solidified into loyalty, courage, and dedication to comrades and leaders. He shed prejudices, respected other races, and earned Rimuru's regard as an endearing subordinate. His father noted profound positive change upon their reunion. Gabiru's abilities surged with his transformations. As lizardman prince, he displayed competent leadership and tactical observation, noted by Rimuru as having excellence potential. As a dragonewt, he gained enhanced physicality, flight, and wielded the legendary Vortex Spear from his father. Renaming by Rimuru granted the Unique Skill "Showoff" (Midasmono), enabling daily fate manipulation, and access to Dragon Warrior Form (Dragon Body) for boosted attack, defense, and healing. His true dragonewt awakening as "Heavenly Dragon King" bestowed the Ultimate Gift "King of Moods" (Mood Maker), accelerating thought, expanding fate manipulation, controlling unexpected events, manipulating space, and deploying multiple barriers. His combat power reached 1,263,824, spiking by 1,000,000 with the Vortex Spear. Within the Jura-Tempest Federation, Gabiru captains the Hiryuu of Tempest—the aerial attack force Flying Dragon Corps—leveraging leadership and aerial prowess. He also serves in the research department alongside Vesta, playing a major role in producing Hipokute herbs and healing potions, advancing Tempest's medical and economic standing. His strength secured him a place among Rimuru's elite Twelve Guardian Lords, marking him as a top executive and nation protector. Key relationships define Gabiru. His sister Souka acts as his minder, sharing a close though bickering bond. Followers display unwavering loyalty, joining his exile. He harbors deep respect and gratitude toward Rimuru for redemption, power, and purpose. Collaboration with Vesta forged a significant friendship. His dynamic with father Abiru evolved from conflict to reconciliation, with Abiru secretly hoping Tempest's diversity would foster Gabiru's growth. A spin-off moment saw him nearly provoke ancient demon lord Milim Nava by grandiosely dubbing himself "hero," underscoring lingering grandiosity. Gabiru speaks with flamboyance, using declarations like "My name is Gabiru. Take it with you as a souvenir, to the other world!" and "Ta-da!" entrances. His name derives from the gavial crocodile. Despite gaining wings, he sometimes forgets to use them, causing comedic mishaps. He uniquely had his name overwritten by Rimuru during renaming.