Whizbang Dustyboots
Gnometown Hero
Duplicate the assassin from the edition of your choice, rewrite without the alignment restriction (or change it to "any non-good"), tweak in the one or two other places required (as I recall, he's not a spellcaster, either), and done.The essential challenges are simple: You can't have an Assassin who isn't Evil.
And of course, the old problem of trying to recreate the flavor of a character outside the world that formed him.
The rest are just specialized poisons, which I'd probably build using the potion creation rules.
It's not a hard challenge to recreate him.