My worst was definitely Rinoa Heartilly from Final Fantasy VIII.
Final Fantasy VIII was my first JRPG. At first, I really liked her. But, as a party member, I seriously could not stand her and being forced to have her in my party at times was an absolute pain. It didn't help I didn't bother to level her up much, I will admit, but I just couldn't stand her being a part of my main party. You're so weak Rinoa omggg;;;.I also feel like she contributed massively to diminish Squall's character. He had his own flaws, and an ice cold attitude but I feel he was a very 'real' character despite what his relationship with Rinoa defined him as.
Who is your's