Nero Claudius from the FATE franchise (Fate/EXTRA and F/GO).

Fancy, ornate, or regal clothing in reds, golds, and whites. Anything from the more feminine or more masculine styles is good, or mixing both.

Casual clothing should be stylish and accessorized.

From the FATE wiki:

[She feels she is an artist before an emperor, truly thinking that she is the pinnacle of the arts and "an artist who rivals the god of arts Apollo." Citing it as her true calling, she boasts various accomplishments, such as writing and singing songs, painting, sculpting, writing, fashion design, architecture, acting, and metalwork. She cherishes the theatre the most, but still prides herself on the rest of her works. She feels that only through art can she express what she feels, as she finds it difficult to do so in a normal way.]

- Fate Wiki: Nero Claudius - Arts