Samus Is a Girl/Playing With

Basic Trope: A fighter in full armor or some other form of gender-masking attire is revealed to be female.
 * Straight: Bob is saved by a warrior wearing a full suit of armor. The warrior is revealed to be Alice when she takes her helmet off.
 * Exaggerated: The armored warrior appears to be the pinnacle of masculinity. Underneath the armor is Alice, an incredibly feminine woman.
 * It isn't revealed that Alice is a woman until the very end of the last episode.
 * Justified: Alice's armor suit is either designed for men or designed in a very unisex manner.
 * Inverted: A warrior in very sleek, feminine-looking armor takes off their helmet. Inside the suit is Bob.
 * We're led to believe that The Hero is out to Save the Princess, but when he finally pulls off the rescue, we see him rescue Prince Bob.
 * Subverted: "Alice" later reveals himself to be an effeminate man named Alex.
 * Alice is Robot Girl or Humanoid Alien.
 * Double Subverted: "Alex" is then revealed to be a Sweet Polly Oliver pulled by Alice in order to get the armor in the first place.
 * Even if Alice is not human, she is still technically female.
 * Parodied: Alice's "gender-concealing" armor is nothing more than a hat or a set of eyewear. Before the reveal, she is treated like a man despite obviously looking like a woman.
 * Alternatively: Alice's armor even changes her voice... When she's in her armor, she sounds like James Earl Jones.
 * Alice mannerisms and speech (even if it's muffled by the suit) are incredibly girlish. Yet, everyone gets shocked when she removes the armor for the first time.
 * Deconstructed: Alice has never before been seen without her armor, thus does all her work with everyone under the assumption she is a man. After The Reveal, the supporting characters take her less seriously, and feel she is "less up for the task" while ignoring her previous achievements to the contrary.
 * Reconstructed: Alice proves herself as a much more than capable warrior in a Take That to the men who doubted her.
 * Zig Zagged: Without her armor, Alice is a weak and defenseless girl who has no power. Which is pointed out by the men.
 * Averted: Alice's gender is made known to the viewers before she starts kicking butt in a suit of armor.
 * Alice's gender can be recognized by her armor.
 * The warrior never takes off its helmet.
 * Enforced: The author thinks the book needs Girls Need Role Models.
 * Lampshaded: "Wait, you're a girl?!"
 * "What do I have to do, put pretty pink ribbons on the chainguns? YES, I'M A GIRL! GET OVER IT!"
 * Invoked: Alice's peers are sexist, so she disguises herself in a bulky suit of armor, kicks ass, then intentionally reveals herself in order to prove a point.
 * Defied: Alice deliberately uses one of the aversions of this trope to make sure that nobody mistakes her for a guy.
 * Discussed: A character says, "This is one of those moments where a tough guy swoops in, saves the day...and turns out to be a girl."
 * Conversed: Someone jokes, "Hey, wouldn't it be hilarious if that big armored guy over there turned out to be a girl?"

Wait a minute, Samus Is a Girl?