Kasumi Kingston
aka Sailor Sun
Kasumi is the the daughter of mob lord Tenzen Kingston, and ex-assasin Tamono Mikasa. She is the second, only nine tailed vulepkin to exist, due to her father being the only other to exist.
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Vulepkin used to be extremely powerful and sport nine tails. However, after a peace treaty was made between planet Inari and the moon kingdom, their tails were reduced to two. Tenzen however, fled before it happened and returned to only land on earth and become the lord of the infamous Yakuza.
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Living a life of luxury and fame, she never questioned her father's motives and ways of doing things, that is until Tamono appeared one day and found her. She explained to her that she was her mother, and that Katsumi is Kasumi's sister though Tamono.
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Seeing how she was lied to by her own father, she would quickly realize that her father has only had her around as a means of power and possibly passing the torch. That is, until several days prior, she unintentionally ruined his plans of overthrowing the royal family, by accidentally revealing his plans to our heroes.
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In her past life, she was one of the most powerful Sailor Senshi of the whole solar system. The fact of the matter however, is that she was very prideful, arrogant, and seen the other senshi as weaker and insignificant to her. Solar Knight was her personal knight and lover, however she was extremely controlling over him and her arrogant attitude eventually drove him off planet, which was the sun.
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After Tenzen's arrest, she now serves King Endymion and Queen Serenity as another Sailor Senshi. However, she is under training and watch of the the other senshi, mainly her younger sister who is more experienced and more trustworthy.