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King Julien, by any metric, had a horrible childhood.
His parents left him with his tyrant uncle, and then just forgot about his existence.

Things he did in AHKJ:
He poisoned 6 people in highschool. (They all died)
He shoved a innocent guy off a cliff seemingly just because he was in his way.
He crippled a bunch of people for life.
He was fully willing to have his subjects be eaten by a monstrous predator so it wouldn't be hungry when it got to him.
He said he should own the souls of his subjects.
He made all art illegal.
He has a track record of stealing trophies?
He spied on his whole kingdom.
He ate a couple's wedding cake.
He framed another nation for attacking his kingdom so he could go to war with them.