I have a strong possibility of a Miraculous ending but it's a bit sad
After many long years of constant struggle reaching the final year of university for Marinette and Adrien where they stood on the verge of graduation and building their future Chrysalis decided to launch her ultimate hellish plan that she had prepared for so long she began by blackmailing Marinettes parents and putting immense pressure on them before releasing terrifying powers that surpassed all limits causing the entire human race to turn into an army of Akumas under her command she did not stop there but began to destroy Adrien psychologically from within taking advantage of his ignorance of her identity to convince him in his graduation year that Marinette was nothing but a professional actress who had deceived him throughout their young adult years and that she hid her identity as Ladybug to manipulate his feelings and exploit his family fortune she also revealed with cold blood the truth about his father Gabriel and that he was Hawk Moth and Monarch claiming that Marinette knew everything and remained silent to benefit from his status with diabolical cunning she managed to turn all the Miraculous holders against Marinette without magic but through lies and discord she exposed the corruption of authorities from the mayor and police to world leaders declaring herself the absolute ruler of the universe with an iron fist in a funeral like scene where the sky turned a deep blood red she burned the temples killed the guardians and merged with all the cosmic Miraculous boxes to transform into the Lady of Darkness who threatened all of existence in the depth of that tragedy while Marinette hid in the sewers broken and outcast by the world she begged Lila with burning tears to end this nightmare take the Miraculous and akumatize her so she could rest from her pain but Lila cruelly refused to enjoy seeing the former hero of Paris slowly dying from within in that desperate moment Bunnix appeared in all her forms from teenager to elder accompanied by Su Han to save Marinette and take her to the Rabbit Hole where the elderly Bunnix confirmed that time had reached a dead end and there was no alternative but to merge the Ladybug and Cat Noir Miraculous to make a wish that would rewrite destiny Bunnix traveled back to the distant past to borrow the Cat Noir ring from Master Fu who handed it to her sadly as if he knew this was the end then she returned and gave it to Marinette who summoned the cosmic entity Gimmi and asked for one wish with a heavy price which was to erase her past existence from everyones memory completely and that no one should remember her sacrifices except Adrien for whom she requested to become a fully natural human to escape his fate as a sentimonster with the fulfillment of the wish the scales of time flipped and Lila was erased from existence as if she were never born Adrien woke up in a new reality finding his parents Emilie and Gabriel alive showering him with love in a quiet normal life while Marinette appeared as a stunning young woman with long flowing hair living a successful life after her graduation with new friends she had never met anyone from her old past and engaged to a new fiancé whom she loved far from the memories of heroism and battles meanwhile Tikki appeared to Adrien crying bitterly to tell him that Marinette sacrificed everything for him and that she was the greatest Miraculous holder in history when Adrien tried frantically to reach her and remind her of their love Marinette looked at him as a complete stranger and with a polite smile told him that she did not remember him at all and that what he was telling was nothing but an affecting fictional story then she kindly apologized to make it to a date with her fiancé leaving Adrien alone in the wind of memories the scene ends with him as an old man overcome by gray hair sitting alone writing the details of that epic in his diary with tears burning his eyes whispering I will never forget you my Ladybug no matter how time changes and the world loses its memory