>>718633327
because she is. to use Senran terminology, she is Yang energy dominant. Dynamic, energetic, assertive. She is explicitly compared to the Sun, a traditional Asian symbol of masculinity. for contrast, Yumi is Yin dominant. peaceful, tranquil, cold, stoic, patient, and is directly compared to the Moon which is an Asian symbol of femininity.
Maybe by western standards she's 'girlish', but that's because true femininity is nearly extinct in the west because all women have severe penis envy and desperately try and act like men.