Sarina is an explosive, envious, vengeful, resentful and hypocritical girl as seen in the memories of Aya Asagiri. Her passage to Magical Girl made her thirst for revenge and hatred, increase even more as she began to openly plot to not only kill Aya Asagiri but ended up trying to kill Tsuyuno Yatsumura and Rina Shioi with Nijimi Anazawa's help, she was shown to be highly hypocritical as seen when she openly blamed and demanded to know why Aya killed her friend (despite the obvious reason being self-defense and she acted as if she was some sort of victim when in truth the entire situation was the result of her own bullying and abuse to Aya.
Most of the time during this incident, she was cold, taunting and someone that provokes others easily. An example of this is when Aya was speaking in a low voice and taunted her about how she couldnt hear her, and was also quite sardonic, Which a prime example of this is in Chapter One of the Manga, where she mocks Aya Asagiri About Mya's death In a grim manner without any remorse.
However, in the later chapters, it is shown that she is becoming a kinder, and more selfless individual, as she was possibly touched by Aya's kindness and even offered Aya to take some of her lifespan after she had depleted her own to save her both Sarina's life and the lives of their comrades in order to fight with together against the Administrators. Later she even admitted that after reflecting on her past actions she now regrets her past behavior towards Aya and is now trying to make amends with her and even told her that she had to survive no matter what, and became great companions with Aya to a point where she partnered up with her to fight an Administrator.
