•||ᴛᴇᴇɴ ʀɪᴠᴀʟʀʏ||• ʏᴏᴜɴɢ ᴋᴀᴋᴀꜱʜɪ x ᴏᴄ

Kosaki is a prodigy, but she wasn't stuck-up in the slightest. She was humble, but is incredibly competitive if you challenge her. Kosaki loved nothing more than a good, hard challenge.
Her confidence completely dissolved when her father, whom she was very close with, died during a mission. Kosaki was miserable and hid herself away, avoiding human contact and rarely breathing a word.