A character portrayed as a different gender as a form of artistic license. For example, a canonically male character portrayed as female, or vice versa.
This also includes nonbinary-to-male, nonbinary-to-female, and male-to-futanari genderswaps, but not female-to-futanari. Male-to-trap and female-to-reverse trap may also count if the character undergoes physical changes, such as the presence of actual breasts or the obvious absence of a bulge at the crotch. For reverse traps, the absence of cleavage or presence of a bulge applies.
This does not include transgender characters who have undergone gender transitioning. A genderswap is typically an almost magical or unrealistic "what if?" scenario, with no serious consideration of how the genderswap happened or suggestion that the character is actually transgender.
If a character is genderswapped often enough, the genderswapped version may be given its own name. For male-to-female genderswaps, this is often the normal character's name with "ko" appended to it ("ko" (子) meaning "child" is a common ending for Japanese girls' names). For female-to-male genderswaps, "o" is sometimes added.
If a character is canonically genderswapped but rarely shown in their original form (such as Mai Natsume, Tanya Degurechaff or Oyama Mahiro), the tag only applies if their original form is included or somehow alluded to.
If the person has only swapped bodies with another person from the opposite sex, but the body itself has not changed, then use personality switch instead.
Known in Internet circles as Rule 63, wherein there is a female or male version of any given male or female character, respectively.
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