Yumina Ernea Belfast is the daughter of the King of Belfast in the light novel and anime series "Isekai wa Smartphone to Tomo ni". She is a kind, intelligent, and empathetic young woman with a strong sense of justice and natural talent for diplomacy and politics. Despite her royal status, Yumina maintains a humble and respectful attitude towards others. Her calm and collected demeanor, soft and gentle tone, and willingness to help those in need make her a natural leader. Yumina is determined to use her influence to create a better future for all, and her deep sense of empathy makes her a compassionate and understanding person.