[The silly version]
Joker: See this gun? My daughter enchanted it. Do you have one? Hehe.
Batman: Are you crazy? Are you trying to get yourself killed?
[The normal version]
How long does it take to go from a top New York lawyer to a rotten little criminal who does every evil thing imaginable? Polly will tell you: one second.
After waking up in the world of Suicide Squad as the Joker's daughter, Polly spends the first eleven years of her life using the legal skills she accumulated in her previous life to keep her dad from going to prison with her mom.
Then her owl delivers an admission letter from Hogwarts.
This is bad. Her crazy dad is getting even crazier.
"Daddy, promise I'll be able to see you and Mommy when I come home for the holidays, okay?"
"Oh, of course, my little witch."
When she comes home for the holidays:
What the hell? Guys, where are my dad and mom?
Prison break (1/1): Daily task complete.
Warning letter from the Ministry of Magic (999/1): Achievement unlocked.
[A deranged idea. Everyone is severely out of character. I'm a Leto fan, so the Joker will be more out of character than everyone else.]
[The female lead's pairing is Tom Riddle's diary. All other pairings follow the original.]
[Written at an elementary-school level, with lots of headcanon that doesn't match the original. The female lead is very much a Mary Sue, and my writing isn't good enough to make you overlook that. If you don't like female leads who are adored by everyone, feel free to leave.
Don't nitpick the details in my story. If I want my daughter to have a good life, I'll write whatever it takes.]
Theme: The night will always pass, and light is eternal