Chaos Monk from Dragon 335 p88 must be any chaotic alignment. Monk is absolutely awful, don't use it, go Unarmed Swordsage instead. Or go with literally any melee build and wear a Monk's Belt.

Scarlet Corsair may be worth a look, if your'e into intimidating, but I'd only bother with five levels. Fighter 9 with Zhentarim Soldier (reflavored), Thug, and Sneak Attack instead of bonus feats would be a good start for going into that. Take Imperious Command in DotU, so you can Initmidate as a swift action, Scourge of the Seas makes it affect all enemies in 30 ft., and they'll cower for a number of rounds equal to your Cha modifier.