Fan Casting The Cassandra in Sort by Tropes

A person characterized by two things — while they do give correct and accurate warnings and predictions, what they say is consistently belittled or ignored by the rest of the cast. You would think that the other characters would eventually decide that they can be trusted, but the characters seldom do. A particularly cruel plot twist is for the rest of the cast to believe them on the one and only time they are wrong, just to maintain the status quo.