Look a Little Deeper
If you just look at the surface of a character you oftentimes miss some of the most important aspects they have to offer. If you look deeper you'll find the true person.

Seiya is definitely the most flirtatious of the Three Lights and it seems to come out even more when he is with Usagi. Seiya saw something in her before he even met her. Her shining heart caught his attention within a brief moment of passing in an airport. Seiya, Kou connects immediately with Usagi even if Usagi does not with him. He shows a willingness to protect her and quickly develops romantic feelings for her. The only problem is that he is not loved in return, at least, not in the romantic sense. Usagi never let go of her love for Mamoru. Though, you have to wonder if the two's closeness was due to an attraction toward each other or to their wish to be with the one they were longing to see. Usagi found that Seiya reminded her of Mamoru and Seiya saw his Kakyuu Princess in her. Though, it seems that Seiya's feelings eventually moved beyond his longing for his princess. Seiya showed jealousy of the man that held Usagi's heart and even after being reunited with the princess she showed her feelings for Usagi.

As Starfighter, she was willing to accept help from the sailor soldiers of Earth whereas her companions, Starmaker and Starhealer did not wish to be involved with them. In my opinion, the she is the most open-minded of the Sailor Starlights. Starfighter's dream, like the other two Starlights, dreams of being reunited with her princess. Forever she is calling to her through the songs done in concert. She sends out her message with all her heart hoping that it will reach her shining star, her princess.

The Ups and Downs
Every person has their good points and their bad points. That goes for animated characters as well so I have make a little list to go over some of these points.

Character Pros: She is willing to work together with the Sailor Moon and the other soldiers. She is very open-minded about things.

Character Cons: She can be very egotistical as Seiya. She can be too flirtatious with girls.

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