A character who agrees as much as possible to become as close as they can to their
love interest. They do pretty much whatever their love wants. This always leaves them open for
manipulation due to not thinking about the consequences, always saying "
un, un, un!" (yes, yes, yes!)
Character 1: Why is
Sarah doing everything Jack says and wants?
Character 2: Oh she must be a
Undere if she's following him around and doing as
he says.