Galkie is a prominent antagonist in the anime Majestic Prince, serving as a major figure within the alien forces opposing humanity. He is a male character whose background is defined by a ruthless pursuit of power. He secured his position as emperor by assassinating his own father and seizing the empire's de facto control. To consolidate his rule further, he had his mother, the former empress, confined. This act of patricide and usurpation established him as a cold and ambitious leader.

In terms of personality, Galkie is described as a cold-hearted rationalist. His decisions are driven by logic and a calculated sense of purpose rather than emotion. He claims to have received a divine mandate, which he uses as the justification for launching an invasion of Earth. This portrayal frames him as a character who cloaks his pragmatic and ruthless ambition in a veil of destiny or higher purpose.

His role in the story is that of a primary antagonist and a key decision-maker for the invading forces. He is the older half-brother of Jiart, another significant antagonist in the series. Unlike his more hot-blooded and battle-hungry sibling, who relishes personal combat with the protagonists of Team Rabbits, Galkie represents the cold, strategic apex of their civilization. While Jiart is driven by a warrior's thrill for the hunt, Galkie is the emperor who commands from the shadows.

Given the available information, specific details regarding his personal motivations beyond conquest, his developmental arc throughout the story, the full scope of his notable abilities, and his key relationships outside of his immediate family are not detailed in the source material. His primary relationship defined is with his younger half-brother, Jiart, highlighting the contrast between their methods and personalities as leaders of their species.