Basic Trope: An effeminate badass male character, who's badassitude is aided rather than hindered by his effeminacy.
Bob is a highly competent pirate captain whose dandified appearance and effeminate mannerisms are as much a part of his personality as his being a master swordsman. This combination serves to make him seem particularly secure in his masculinity which makes his opponents uncomfortable.
Alternatively, Bob is The Casanova who uses the fact that most women assume that he's Camp Gay (based on his natural feminine personality and appearance) to get into their pants.
Exaggerated: Bob is the best secret agent in the world: he's a master of disguise because he's taught himself so much about makeup, he's got superb balance from walking in heels, he's so beautiful that Even the Guys Want Him (as well as all the girls), and he uses things like stilettos and straightening irons as deadly weapons when he doesn't have his color coordinated gun handy.
Downplayed: Bob is an effeminate member of a Glam Rock band (like David Bowie in his Ziggy Stardust days) who happens to be very muscular because he lugs heavy amps and other equipment.
Bob's naturally flamboyant personality and bishounen looks have made him a prime target for bullies and homophobic harassment (even though he's not homosexual or even bi), so he takes up masculine sports and self-defense to prove to his peers that he's not a sissy.
Bob was raised by Amazons as a girl and now rules with a bejeweled, iron fist.
Bob's mom nurtured his femininity between the ages of 3 to 10. From 11 to 17, his father tried to reverse the effects by making a man out of him (taking him fishing, hunting, getting him involved in sports, etc). Rather than choose between these two gender stereotypes, he decides to blend them to make for an interesting persona.
Bob is shown to be highly effeminate—wearing makeup and walking very swishy—and then beats a guy up for irritating him. However it turns out that Bob is just undercover as an effeminate man, and in actuality he's quite butch.
Alternatively Bob bursts into tears after beating up the guy. He's naturally effeminate, but absolutely hates doing anything badass despite being good at it.
Alternatively, Bob is effeminate and set up as a huge badass, but then loses miserably to his opponent.
Alternatively, Bob is initially shown to be quite effeminate, as well as quite badass. He then claims that the effeminacy is just a ploy and that he's normally quite butch, however it turns out that he's actually even more effeminate than initially shown and was playing at being masculine as part of another cover.
It seems Bob is naturally effeminate but hates doing anything badass (despite being shown to be good at it); however it turns out that his reluctance to be tough is just a ploy, and he's actually been working as a super assassin without anyone knowing.
Alternatively Bob is effeminate and set up as a huge badass, and then seems about to lose horribly to his opponent, but then at the last second, he starts fighting in earnest; turns out he was just getting them to let their guard down.
Parodied: Bob is an effeminate man who after being buried in a shipment of designer clothes gains fashion based super powers.
Zig Zagged: Bob was originally Alice, who was a Badass PrincessBifauxnen who's elected to live as a Camp Gay man. The hardships of being a trans man as well as being an effeminate male have made Bob the toughest guy in the kingdom.