Why do so few little sister characters have a brother who is not the protagonist?
So it occurs to me that little sisters characters are usually either the protagonist's sister, the little sister of a more prominent female character, or not really a little sister at all, but merely a character who exhibits traits typical for a little sister character.
Why is it that's it's so rare for little sisters to have an older brother who is not the protagonist? Seems like they'd have some serious comedic potential, particularly if the older brother is a friend of the protagonist, yet I can only think of a few examples with Mei from Clannad being perhaps the most prominent.
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