The word "dere" comes from "deredere" (デレデレ), an onomatopoeia meaning "lovestruck" or "lovey dovey". Dere type characters are characters that express their affection in different ways, or on different levels. Most of the dere types are how characters react to becoming lovestruck.
What does Dere mean in Japanese?
To start with, the term “dere” itself comes from the Japanese word “deredere” (デレデレ) which is the onomatopoeia for being lovestruck. By combining this word with other words, we get these new terms which describe love interests in anime and games.
What is a dere person?
The Deredere is very energetic, kind, and caring towards others. Out of all the personality types, they're the more stable and tend to be the main character. While they show their affection towards a loved one, they can still hold normal relations with others.