Not necessarily... I don't re-call Edea hating her life, she was more so possesed. Her real self is a kind and caring person. Kefka never showed any signs of being "emo" just extremely angry and psychopathic. He hated everyone except himself. Seymour "emo"? No, he's just...weird (SPOILER)and obviously he didn't hate his life if he wanted to sustain it even after getting killed.