Cooldere

Cooldere( _ja. クーデレ)is personality of a character often found in Anime or Dating Sim, replacing 'Tsu' to 'Cool' from Tsundere, adding coolness to the original version. While Tsundere suffers from extreme emotional change concerning protagonist, Cooldere does not show any sign of interset, maintaining pokerface and silence.
Cooldere shows its affection to protagonist by doing favorable things in secret manner, often categorized as an evolved version over Tsundere.

Arguably first used in news board in 2chan.

Well known cooldere characters are:
*Haruhi Suzumiya
*Rei Ayanami