Ginti is one of the arbiters responsible for judging the souls of the dead in the afterlife, presiding over a bar on the 20th floor of the towering structure known as the Totem, which houses many such establishments. He serves as a clear counterpart to the series' main arbiter, Decim, and their contrasting personalities are central to understanding his character. While Decim is calm, stoic, and approaches his duties with a detached sense of professional pride, Ginti is impatient, cynical, and often appears bored or irritated with his work.

Ginti's personality is immediately noticeable for its bluntness and lack of warmth. He has little patience for the humans he is meant to judge, often seeming to view them as foolish or inconvenient. His speech is direct and can be perceived as rude, and his expression is frequently set in a glare. This attitude extends to his methods of judgment. Unlike Decim, who seeks to understand the guests who arrive at his bar, Ginti treats his role as a simple, perhaps tedious, job to be completed. He is not above creating "extreme conditions" during the games to force his guests to reveal their darkest natures, and he seems to derive a certain enjoyment or entertainment from their suffering and desperate reactions. A key example of this is during the judgment of two guests, Harada and Mayu, where he presents a cruel and deceptive choice to one of them regarding the other's fate, showcasing his sadistic side.

His cynical worldview is rooted in his belief that his status as an arbiter makes him superior to humans. He dismisses complex human emotions such as love and devotion as pointless or incomprehensible, seeing the human drive to live as ignorance of the inevitability of death. This arrogance is frequently paired with a short temper; Ginti is quick to frustration and anger, often solving disagreements with shouting or physical aggression rather than rational discussion. This is most clearly seen when he visits Decim's bar, the Quindecim, disguised as a young boy. After revealing his true identity, he immediately picks a fight with Decim over a disagreement, a scuffle that only ends when he is physically subdued by their superior, Nona.

Despite his abrasive nature, Ginti is not portrayed as a villain without any nuance. He is shown to have a gentle relationship with his pet cat, Memine, and he does hesitate or show a different side when a judged soul makes a particularly strong impression on him. However, his fundamental lack of empathy prevents him from fully understanding the experiences of the humans he oversees. This makes his role in the story essential as a foil; his cruel and efficient methods highlight Decim's growing emotional complexity and the experimental nature of Nona's project to make arbiters more human. While a relatively new arbiter at only five years old, his judgments are final and serve as a stark contrast to the evolving, more compassionate approach being explored by Decim. He is a red oni to Decim's blue, bringing an aggressive, hot-headed energy that clashes with the main protagonist's calm demeanor.

As an arbiter, Ginti possesses abilities beyond those of a normal human, including enhanced strength, incredible speed, and agility that defies normal physics. In his brief confrontation with Decim, he demonstrates his capability as a physical fighter, moving quickly and engaging in combat. His primary role, however, has less to do with unique powers and more to do with his unyielding adherence to a harsh and mechanical interpretation of judgment, serving as a direct contrast to the central themes of the series exploring empathy, morality, and what it means to be alive.