Himiko is a villain affiliated with the League of Villains and part of its Vanguard Action Squad. She and the rest of her team serve as the main antagonists of the School Trip Arc. Himiko is a relatively petite, fair-skinned girl, who is very prone to blushing and frequently described as having a rather pretty face. Himiko is a very cheerful girl, to the point of smiling even after having presumably killed someone, displaying apparent sadistic tendencies. Himiko also is mentally unstable and has a very twisted perception of love.
(Source: Boku no Hero Academia Wikia)