Gender fluidity

gender identity which doesn't conform to fixed gender roles or varies over time

Detransition is the cessation or reversal of a transgender identification or of gender transition, temporarily or permanently, through social, legal, and/or medical means. This process may be based on a number of reasons, including a shift in gender identity, health concerns, social or economic pressure such as trans healthcare bans, discrimination, stigma, political beliefs, or religious beliefs. The estimated prevalence of detransition varies depending on definitions and methodology but is generally found to be rare.

Internet meme involving gender reversal of an existing male/female character