Too be honest, mary sue is too generic for me. Because luna isnt actually a true mary sue. She has her issues, some of them even intentional ones created by the author! She isnt flawless and its pretty clearly the case in story, but as part of the DD snark squad i got used to using her to denote an annoying character that is somehow a messiah type despite a great deal of confusion as to how it even happened because despite being great (so great) she is also an awful character. But yeah, because this is the message board where I spent literal years snarking and reading snark about the comic I used the term when I recognized the character without thinking that despite it being a thread that went through like 30 sets of 50 pages over the course of its existence, not everyone reads or knows about it.