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Junko Enoshima and her twin sister, Mukuro Ikusaba were born and raised into a loving family. She abused her sister and everyone around her because she didn't know how to express her love for them. She fell so in love with Despair that she killed her own family and her own boyfriend. She manipulated Mukuro to do her bidding and the twins destroyed the world and opened up the school where Mukuro will be killed. Junko killed Mukuro because she thought it'd be a great example of what will happen to them if they didn't do what she said.
Junko has a chaotic and amusing personality. She was pretty crazy during the whole series and had weird moodswings randomly. Fans love her because of how amusing she is. She was also abusive to her twin sister the entire time, but she did love her. She just didn't know how to treat the people she loved so she treated them like garbage.
When Junko revealed herself, she proposed another game. If Makoto can get more people on hopes side, she'd be executed, but if she got even one perso on despair side, Makoto would be executed. She promised those who come to despairs side some benefits. She doesn't win, of course. She was executed by getting crushed by a huge construction block.
Junko's goal in life is to make everyone as miserable as her. She started the killing game to make everyone depressed and upset. She thinks the feeling of despair is amazing and she wants everyone to feel the same.
For some time she was my favorite character because she's the whole reason the entire game started. She also ended the world with a bear and a school. I also liked her for how chaotic and amusing she was. I now have mixed feelings about her since she was the one who tortured one of my favorite characters to death.