I share your thoughts although admittedly I only feel sour towards certain fandom things rather than the character.
Is not so much that Luna’s loved rather than it also often involved Celestia mocking in a lot of pics. Overtime it accumulates until it becomes a souring experience.
It doesn’t help Luna on the large scheme is actually not really a big deal canonically, she’s just a co ruler who rarely seems to do much to stand out. Heck, the jokes about my war against the post office are obviously an exaggeration for April Fools but an exaggeration nonetheless implies some truth behind: Luna’s hobbies in Between Dark And Dawn are notably mundane and not particularly exciting in a fictional setting whereas Celestia showing herself as an innate adventurer really got my interest. Celestia might not have a lot of focus episodes but she actually is really important, she constantly contacts Twilight and the mane 6 for missions, is often involved in the heroes’ shenanigans and a lot of the episodes’ problems and resolutions are often bound to her scheming and their successes or backfirings, she might not do much on camera but she’s actually extremely relevant ironically speaking from the shadows.
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