Tiara

Tiara Victoria Lex Waleland is a fair-skinned girl with medium-length bright red hair. Her eyes are a sky blue color. She appears to be of average height for her age, she is 156 cm tall and weighs 45 kgs. Tiara is often seen wearing a small, silver tiara on her head. There appears to be some sort of string with small jewels (most likely diamonds) attached to her tiara. It was given to her by her older sister, Eliza. She is the leader of LiGHTs. Her fellow member Rosetta is her roommate and childhood friend. Although she looks like a normal girl among special classes, she is actually the second princess of Waleland.

(Source: Wiki)