Tsundere
From MiWiki

Tsundere (ツンデレ) is an archetype where a character is initially cold, but will over time warm up to a character, revealing a hidden warmth. Hiiragi Kagami is a typical tsundere.

“Miyuki-san, you don’t call those faults. You call those ‘moé’ points.” (Lucky Star Volume 1, p. 15.)
This article is about otaku jargon.

Tsundere (ツンデレ) is an archetype where a character is initially cold, but will over time warm up to a character, revealing a hidden warmth. Hiiragi Kagami is a typical tsundere.