An over-the-top narcissistic and somewhat comical opera king. Her behavior is always over-exaggerated, sometimes loudly, and sometimes earnestly boasting about self-love. She seriously believes that those who do not know their own beauty and strength are unfortunate, and she is constantly enlightening the public. She's admired by Meisho Doto.

T.M. Opera O has short, light orange-colored hair with tufts that rise up and curl. The left side of her bangs exposes most of her forehead, while the left covers it. She wears a gold-pink crown on the top of her head, and her ears each bear two golden ornaments clipped on, the ones on her right ear have green jewel inserts. Her purple eyes surround her small ringed pupils.

Opera O's race attire is truly fit for a king, with many golden flourishes, such as her pauldrons, plackart, and gauntlets. Her top is a long-sleeved white garment with golden trim, that is cropped at the stomach and with sleeves that tuck into her gauntlets. She wears seven golden rings on her fingers. Two medals adorn her torso, and a necklace with ribbons and other baubles sits on top. She wears a pink cape with gold trim, and various ribbons on the back. Her skirt is two-toned, with white and pink stripes that alternate. A golden belt with ornaments ties it down, with a green streak furling down onto and across it from her stomach plate. She wears white thigh socks bearing a pink stripe on each leg. Golden greaves lie at her ankles with a unique spiral design, sitting just above her boots.

• Her initial character profile was uploaded to the official Twitter account on April 19, 2017.
  
• Apparently, she has at least 120 gigabytes worth of photos of herself.
  
• Despite all the show and boast, Opera actually comes from a regular family with a little sister and a working mother. This probably reflects the real life conditions of Opera's owner and ranch which was relatively small, despite the great success.
  
• Race uniform design notes from Umamusume Pretty Derby Artworks Vol.02:
  
• 1. "As a reference to 'opera' in the referenced horse name, the design intends to evoke the splendor of a lead character on an opera stage."
  
• 2. Based on his formidable racing record that earned him the nickname "The Conqueror of The Century's End," the design incorporates a crown, gold accessories, and a cape to give a regal impression.
  
• 3. Uniform colors are based on most frequently worn jockey silk patterns, which were predominantly pink with yellow and green striped accents.