Gussie Fink-Nottle: He particularly wanted me to go as Mephistopheles... Jeeves is a great believer in the moral effect of clothes. He thinks I might be emboldened in a striking costume like this. He said a Pirate Chief would be just as good.
Mask of Power needn't be magical: all it needs to do is to cover your face. The symbolism noted under that trope, of taking a new face and thus becoming a new person, works especially strong here, and there is no magical effect involved whatsoever: the wearer becomes more powerful and confident simply because of the psychological effect.
Always a Cool Mask by default. Compare Beneath the Mask and Magic Feather. Split Personality, Secret-Identity Identity, and What You Are in the Dark are often related. Not to be confused with Inferiority Superiority Complex, which about unconfident characters who pretend they are confident.
- In One Piece, after leaving the Straw Hat Crew, Usopp develops an alternate identity of Sogeking, so that he might still help to save his companion without betraying his true identity to the rest of the crew and let them know that he did not leave (it doesn't work, but that's beside the point). The mask included in the costume is nothing but a common carnival souvenir but "Sogeking" is drawn out once again in a future battle and grants Usopp enough confidence to win.
- Mamoru in Fafner in the Azure: Dead Aggressor wears a Goubain mask when piloting his Fafner, which makes him act more Hot-Blooded.
- The Adventures Of Panthera Noire: As Panthera, Juleka is almost unrecognizable, becoming a flirty, quick witted sass master. Ironically, her mask actually makes her insecurities in her normal life worse as it leads her to believe that Rose is in love with Panthera and not to the real her.
- The Mask revolves around an actual Mask of Power that grants the shy, lovesick Stanley Ipkiss an absurd level of confidence (and Reality Warper powers) as the title character, but when he asks an anthropologist for more information about the artifact, he doesn't believe it's magic and instead brings up the psychological effect of wearing a mask!
- In Star Wars, the villainous Kylo Ren is a much darker take on this. When he's wearing a black, voice-altering mask (deliberately designed after Darth Vader's), he comes off as more cold, menacing and controlled. When the mask's off, he is a lot more awkward and emotional to the point where it's implied part of the reason he wears the mask is to hide his true feelings. Case in point, his master Snoke contemptuously tells him to "take that ridiculous thing off".
- The self-help book Goodbye Shy, which is about beating shyness, recounts an anecdote of a young boy who was painfully shy in public to the point of never speaking or interacting with anyone until he was allowed to wear a mask to school one day. In an instant, he loudly declared himself to be "Nobody", and became gregarious and friendly. As this became his new normal, he made lots of friends and stopped needing the mask.
- In the Discworld book Maskerade, no one suspects that Walter Plinge could be the Phantom, because without the mask he acts like an altogether different person. When Granny and Agnes give him an "invisible mask" to face Salzella at the climax, he retains the confidence and poise of his alter ego.
- The titular item in The Stragglers Mask, when given to the Lovable Coward Peal and told that it's magic, allows him to stand tall and perform actual heroic deeds. How much of it is this trope, how much Magic Feather, and how much actually magical, is left ambiguous to the very end.
- The hunters' warpaint in Lord of the Flies.
- In Masques, Aralorn's friend Wolf wears a mask. His face is heavily scarred, but apart from that he looks exactly like his evil father, so he really needs a new face.
- As the quote page says, At Right Ho, Jeeves, Jeeves invokes this trope advising Gussie Fink-Nottle, who Cannot Spit It Out to Madeline Basset, to get a pirate costume or a Mephisthopeles costume to a costume ball Madeline has invited Gussie. We will never know if it would have worked because Gussie gives the taxi the wrong address and his costume has not pockets where to save money and he expends the night at jail.
- The Benny Hill Show, "In Boutique Mask Dance." Benny goes to a mask boutique, tries to flirt with the shopgirl who rejects him. He puts a handsome mask on and she's falling all over herself, but he plays hard to get. Then he takes the mask off momentarily and puts it back on, but puts on a female mask by mistake, so now the shopgirl doesn't care for him. He's confused. Then a man enters the shop, sees this beautiful girl (Benny), and tries to woo her.
- The Red Hood's mask in Gotham is basically just some ragged red cloth, yet whoever wears it becomes a confident, dangerous villain.
- In Vampire: The Masquerade Alessio Rinaldi AKA the Peacock Prince has found himself with a rather problematic case of this: as the Malkavian Prince of Ravenna, he's more than capable of dealing with all the problems that governance throws at him - but only once he dons his mask of peacock feathers. Without it, he's frail, meek, and incapable of dealing with his station as prince... and worse still, the Peacock Prince has actually begun to develop into an independent personality in its own right.
- Flipside: Maytag is outgoing and freethinking when in her jester outfit, and extremely shy and neurotic without it.