One possible scenario could be that Adrian plans an elaborate, romantic proposal. He might take Marinette to their special place, like the park where they first met, and get down on one knee surrounded by beautiful flowers and candles. Another scenario could be that he proposes during a big event, like a masquerade ball where they are both dressed up. He could remove his mask and present the ring with a big, heartfelt speech.
The relationship between Adrian and Marinette is full of ups and downs in the original story. So, seeing Adrian finally take the step to propose adds a new and exciting dimension. It's interesting to see how their dynamic changes from being friends or just having a crush on each other to something more serious. Also, the way Adrian plans the proposal, whether it's a grand gesture or a simple but heartfelt one, can be really engaging.
Maybe Adrien plans a big event at the school. He decorates the classroom where they have shared so many memories. He invites all their friends and family secretly. Then, in the middle of a speech about how much Marinette means to him, he pulls out the ring and asks her to marry him. Marinette is overjoyed and the whole room erupts in cheers.
Another possibility is that they are on a mission as Ladybug and Chat Noir. They get separated from the villain and find themselves in a secluded alley. In that moment of relief and closeness, they give in to their feelings and kiss. This kiss would be a bit more rushed and urgent compared to the one at the dance, but still full of love.
A major theme is 'slow - burn romance'. Writers love to gradually build up the relationship between Marinette and Adrian. There are also stories centered around 'shared dreams'. Maybe they both have a dream for Paris or for their future together. 'Adventure - based love' is another, where they go on adventures together and their love grows during those experiences.
One interesting scenario could be that Arthur plans an elaborate proposal in a secret, enchanted garden. He decorates it with magical lights and rare flowers. Another could be that he proposes during a grand feast, in front of all their friends and allies, making it a very public and joyous occasion. Or perhaps he takes Merlin on a quest, and at the end of it, when they've achieved something great together, he pops the question.
In another scenario, Batman takes Catwoman to their favorite rooftop in Gotham where they often meet. He has set up a beautiful, simple dinner with candles. After a heartfelt conversation about their journey together, from being enemies to lovers, he pulls out a ring with a diamond that has a unique shape, perhaps resembling the bat - symbol, and asks her to marry him.
One possible scenario could be that Adrien finally gathers the courage during a school event. Maybe it's at a dance where they are sharing a slow dance and he just blurts it out. Another could be that he plans a really elaborate date first, like a picnic in a beautiful park that he knows Marinette loves, and asks her out there. Or perhaps he asks her out after she has helped him with something really important to him, like when she designed a special piece for his father's fashion line and he realizes how amazing she is and that he wants to be more than just friends.
He could be shocked at first. I mean, he has been so close to Marinette all this time without realizing she was Ladybug. His reaction might include disbelief and then a quick acceptance as he starts to piece things together in his mind.
In a fanfiction, Naruto might plan a big public proposal. He could gather all their friends and family in the Hidden Leaf Village. He would make a big speech about how Hinata was the one who saw him when others didn't, and her love changed him. Then, with everyone watching, he would pop the question.
One interesting plot could be Adrian's initial shock and then his realization of all the times Marinette's behavior as Ladybug made sense in her civilian form. For example, her courage as Ladybug might be seen as her standing up to Chloe in her Marinette guise.