Kagami Hiiragi is a central character in the anime series Lucky Star. She is a high school student known for her tsundere personality, balancing a tough exterior with a caring nature. Kagami is the older twin sister of Tsukasa Hiiragi and often acts as the voice of reason among her friends. Despite her sometimes abrasive demeanor, she is deeply loyal and protective of those close to her. Kagami excels academically and is often seen studying diligently, contrasting with her more laid-back friends.