The most effective disguise is rooted in psychology, not costumes. A true badass manipulating their image doesn't just wear a wig; they weaponize expectation. They'll lean hard into a stereotype so opposite their core self that no one thinks to look deeper. Think of the legendary assassin in 'The Night Angel' trilogy who poses as a street urchin, or countless fantasy heroes playing the fool. It's about creating a persona so consistent, so flawed, and so unthreatening that it becomes an emotional blind spot for observers.
What I find fascinating is the internal toll. The character isn't just acting meek; they're constantly filtering every instinctual reaction. A threat appears, and they must consciously choose to flinch instead of counterattack. That moment of restraint, the swallowed retort, the deliberately clumsy movement—it's a performance running on a hair-trigger. The disguise isn't a mask they put on; it's a cage they live inside, and the tension comes from waiting for the moment the bars bend.
My favorite iterations are when the 'disguise' isn't even a conscious choice but a forced circumstance. The royal heir raised as a stable hand, their true nature bleeding through only in moments of extreme duress. That's where you get those delicious, almost accidental reveals—a perfectly executed sword parry during a tavern brawl that was supposed to be just a scuffle, leaving everyone, including the character, momentarily stunned.