To me Quentin in 1897 was very much the embodiment of the word! He could be such an creep, and yet he had a charm about him that you could forgive him anyuthing- well, almost eveything. [spoiler]He had that curse coming for the way he treated Jenny.[/spoiler]
And of course, Nicholas with his fabulous panache. If Roger really had a way with the ladies, he'd be in this category, but fittingly his rival Burke (when Mitch Ryan played him) fits easily. As for Gerard Stlies- he really do anything endearing on the show- he was always plotting against someone, [spoiler]and this was even before Judah took over![/spoiler] Too villainous to be a rogue.
Nathan Forbes started out as a rogue, but when he was exposed as a hypocritical bigamist, he veered staight into villainy like Gerard.
Tim Shaw actually became a rogue [spoiler]after being framed by Trask, like Burke Devlin he had a score to settle and wasn't above using ladies to do it![/spoiler] (Both characters were probably based on Edmond Dantes, aka The Count of Monte Cristo).
But I've really gotta give props to my favorite DS villain, the one and only Count Petofi! Now, that man had panache to spare!! No matter how deliciously bad he got, you just couldn't get enough of him. DS did a major error in not bringing him back to 1969 and instead going with the Leviatan storyline.