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Wiktionary
tsundere

n. 1 (context chiefly Japanese media English) A fictional character who fits the archetype of being cold and even hostile towards another person before gradually showing a warm and caring side over time. 2 (plural of tsundere English)Category:English plurals

Wikipedia
Tsundere

is a Japanese term for a character development process that describes a person who is initially cold and even hostile towards another person before gradually showing a warmer side over time. The word is derived from the terms , meaning to turn away in disgust, and meaning to become 'lovey dovey'. Originally found in Japanese bishōjo games, the word is now part of the otaku moe phenomenon, reaching into other media such as maid cafes, anime, manga, novels, and even mass media. The term was made popular in the visual novel Kimi ga Nozomu Eien.