What is Tsundere?

Tsundere is a character archetype in anime and hentai describing someone who is initially cold, hostile, or dismissive but gradually reveals a warm, loving side. The term combines 'tsuntsun' (aloof) and 'deredere' (lovey-dovey). Classic tsundere characters include Asuka from Evangelion and Rin Tohsaka from Fate. In hentai, tsundere characters often provide entertaining buildup tension before romantic or sexual scenes.