Then Joker comes by and jumps on Lucina's shoulders and shouts, "show me your true form!"

Samus and Zelda are actually doing a pretty good job at it. I bet people will not even know they are actually women for a long time.

…well, the same is true for Lucina in canon, which makes you think how she achieved the same effect with just a mask when the other 2 had to use a full-body armor and literal magic respectively to do it.