Why is the "you can't spoiler things out in the information part of the character section of TV Tropes" rule a thing? Wouldn't it be easier to do away with that rule, so that you can't see the spoilers? And before you say "just add the information without using spoilers", I can assure you, it's easier said than done.

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The section above the line is supposed to be a synopsis. Putting spoilers in it defeats its purpose. Also spoiler tags interfere with the reading experience, so you should use them as little as possible. I assure you, with a little effort, it can be done.