Gorou Amamiya

"The idol named Ai, is way bolder than I expected. She's cunning and strong… and she shines as bright as the first star of the night. My doctor side and my fan side are in agreement. If you say doing that will make you happy, I will obey. After all… you're hopelessly an idol… and I'm hopelessly your captive."

Gorou Amamiya was the main character of the first chapter of the Oshi no Ko manga series. He was a doctor specializing in gynecology and the one responsible for caring for and delivering Ai Hoshino's baby. He is also Aqua Hoshino's previous life.

Appearance
Gorou was a man with dark hair and square-rimmed glasses.

In all of his appearances, he always wore a doctor's white coat.

Personality
Gorou appeared to be a dedicated and compassionate obstetrician who cared deeply about his patients. He was also a fan of idols, but his interest seemed to be driven by a desire to fulfill the wishes of a patient, Sarina Tendouji, rather than any questionable motives. However, the mention of Goro carrying a "loli-con image" raises concerns about his interests. Despite this, Goro is portrayed as understanding and supportive of Ai's pregnancy, indicating that he is capable of empathy and showing  professional diligence , do not mix personal matters.

His willingness to confront a pursuer of Ai, even at the risk of his own life, demonstrates his courage and dedication to protecting those he cares about.

Overall, he is also portrayed as a caring and dedicated professional who is willing to go to great lengths to support his patients.

Etymology

 * The name Gorou means "I, me" (吾) (go) and "son" (郎) (rou).
 * Gorou's surname Amamiya means "rain" (雨) (ame/ama) and "Shinto shrine" (宮) (miya).

Trivia

 * Both Gorou and Sarina are the only characters that were introduced without a surname, up until Chapter 75, where their surnames are both revealed.
 * Japanese medical schools are undergraduate programs that typically last for six years, and the following residency programs typically last for two years. Assuming Gorou finished high school at age 18 and took no gap years before medical school or before his residency, he was likely around 24-26 when he knew Sarina and 28-30 in Chapter 1.