The most tragic and/or mentally unstable main characters I could find, those that could actually make me feel a sense of despair and hopelessness when reading. Some are more subtle. (FL, ML, BL)
You may feel your favorite manga should be gathered together into distinct categories for your own reference and, now, you can do this with a LIST. After you've created your list or lists, you can proudly recommend them to other manga fans to showcase and share your taste in manga.
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