Gabiru/Chronology

Forest Disturbance Arc
Gabiru was used by Gelmud, his former master to satisfy his own gains to turn the Orc Lord into a Demon Lord. He was manipulated into taking over the lizardmen and going into direct confrontation with the orcs, almost leading to the lizardmen's extinction. After the war with the orcs, Gabiru was exiled for his treason. Furthermore, forbidden to ever call himself a lizardman and forbidden to ever return until he proves himself worthy.

Demon Lord Attack Arc
He joined Rimuru Tempest's banner and works in the research department cultivating herbs for potions.

Demon Lord Awakening Arc
After Rimuru's awakening, Gabiru was promoted as one of the executives, therefore, giving him his honor back.

Territorial Seizure Arc
During the opening of Tempest, Gabiru was given the chance to reconcile with his father, Abiru.