Testament, pre-Gear conversion, was a noble individual who loathed violence and avoided conflict at all costs. Compassionate and selfless, Testament had a soft spot for children and sought to help the less fortunate. Despite their benevolent nature, Testament was dutiful and fiercely loyal, always seeking to repay their debts. However, after being forcefully converted into a Gear, Testament's personality took a drastic turn. As a converted Gear, Testament became distant and bitter towards humanity. Traumatized by the horrors of the war, they developed a deep cynicism, haunted by the atrocities they had been forced to commit under Justice's command. Testament retained their consciousness and memory but could not defy Justice's orders. Following Justice's death, Testament regained their true self, burdened with guilt and trauma from their actions as a Gear. The guilt led Testament to seek isolation from humanity, finding solace and purpose in protecting Dizzy and later, the Forest of Demons. Over time, their interactions with Dizzy's "parents" helped restore their sense of humanity and trust in humans, reducing their hostility.