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Eugena has a short and thin build. He has above the shoulder length, light brown hair which is spiked with bangs. He wears royal and formal clothes which are suitable for his age. He wears a long sleeved top in a robe-like style with a cloak attached to his shoulders and trousers with high boots.
Eugena has a quiet and serious personality. He seems to not be bothered by much and has no interest in his older brother's activities. He seems to be dragged around by his sister and chimes in argument with her suggestions. Eugena prefers to keep out of his sister's drama.
- Despite officially being translated in the localized version as "Eugena", the correct transliteration of his name is "Yujina"—which is a common factor for all characters in the series; having a Japanese first name.