There are 4 types of dere.
They are: Tsundere (which is most common among anime), Yandere, Kuudere and Dandere.
Tsundere- Mean on the outside but is sweet on the inside
Dandere- Anti-social and doesn't talk to anyone until the right person comes
Kuudere- Cool and un-emotional but shows sweetness later on
Yandere- Sweet and cute on the outside but scary on the inside
What's your fave? Mine would have to be Kuudere.
(Btw, Men can be dere too.)