In addition to the above, he is also Bhaal, Lord of Get-It-On. THE pimp. I mean, come on, he freakin' got it on with almost EVERY SINGLE SPECIES ON FAERUN! Also, he planned it well enough so he didn't have to pay child support.
"Ah, the child of Bhaal has awoken..."-Jon Irenicus to the hero/heroine waking up in Jon's dungeon.