‘Hey I’m a lesbian’ already tells you that character has probably been treated like an outcast and feels different from the ‘norm’. There’s quick, simple character development already.
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No. If I go out in public and meet 4 people. 3 people give their name and introduce themselves with their job, but the fourth shouts "IM LESBIAN" and starts making out with the nearest woman, it's not "quick, simple character development."
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Obviously they are someone who is very sexual and open. Already just learnt lots about them right there.
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No, you learned that they're lesbian and greet some people by shouting their sexual orentation. Anything further than that is an assumption on your part.
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Assumption happens a lot with characters, especially in short stories when you don’t find out much about them.