Sarina Tendouji

Sarina (さりな, Sarina), full name Tendouji Sarina, is a character in Oshi no Ko manga. She was a child patient under the care of the hospital where Gorou works, and the reason he took a liking, and later on obsessing, over Ai Hoshino. It was revealed that she is Ruby Hoshino's previous life.

Appearance
Sarina has wide eyes, and presumably bald hair due to her sickness. In all of her appearance, Sarina has always wore a wool hat with heart pattern on it, along with a bunny pin adorning it.

Personality
Sarina seems energetic, especially when she was talking about her bias, Ai Hoshino. She also likes to tease Gorou, her doctor and caretaker.

Story
Sarina was first revealed as a patient that made Gorou start obsessing over Ai Hoshino, due to Ai being Sarina's oshi. Sarina, however, died from her disease at his care.

It was later revealed that at the last moment of her life, her parents were too busy to be on her side. Gorou instead was on her side, and she gave him an Ai Hoshino keychain she managed to get from a Gashapon machine on a B-Komachi concert she was able to attend when she was well. She made Gorou promise to take care of it like it was herself, and revealed that she loves Gorou in her last breath. She wondered aloud about what would happen if she was reborn, presumably meaning that she would find him and fall for him again, but unable to finish her words as her hand goes limp, dying while Gorou watches.

Trivia

 * Both Gorou and Sarina are the only characters that were introduced without a surname, all the way until Chapter 75, where their surnames are both revealed.