Full Answer
Perhaps the quintessential example of a classic gender bender anime, Ranma ½ explores the adventures of Ranma Saotome, who becomes cursed when he falls into Jusenkyo's cursed springs during a training journey.
A gender bender is a person who dresses up and acts like the opposite sex.
Gender fluidity refers to change over time in a person's gender expression or gender identity, or both. That change might be in expression, but not identity, or in identity, but not expression. Or both expression and identity might change together.
Gender bending chemicals are a vast and diverse group of chemicals which have been found to mimic, block, or alter the effects of growth and developmental hormones causing reproductive abnormalities in some animals.