Tsundere

Tsundere (ツンデレ, pronounced [tsɯ̥ndeɾe]) is a Japanese term for a character development process that depicts a character with a personality who is initially very harsh before gradually showing a warmer, friendlier side over time. The word is derived from the terms tsun tsun (ツンツン) ('to turn away in disgust or anger') and dere dere (デレデレ) ('to become affectionate'). Originally found in Japanese bishōjo games, the word is now part of the otaku moe phenomenon, reaching into other media. The term was made popular in the visual novel Kimi ga Nozomu Eien.