Kuudere

A kuudere runs cool on the surface at all times. Not hostile, which is the tsundere's job, and not silent, which is the dandere's. She answers questions, she just answers them in the fewest possible words and without visible weather. The affection is there the entire time and shows up in behaviour rather than speech: she remembers what you take in your coffee and never mentions that she remembered.

The name splits as kuu plus dere, where kuu is the English word cool taken into Japanese and dere is the deredere sound-word for turning soft. That makes it the only member of the family with a borrowed half. Rei Ayanami from Neon Genesis Evangelion is the character most often named as the model, though the series came out in 1995 and the label was coined years later by fans.

Writers like the type because it makes small gestures huge. A tsundere has to shout to register a change. A kuudere only has to look at someone for a beat longer than usual, and the audience, trained by twelve episodes of flatness, reads it instantly. The technique is cheap to animate and works better than almost anything louder.