I think Queen Chrysalis could also be a possible main character. Since she caused so much chaos during the Canterlot Wedding, in this fanfiction she could be in a situation where she has to apologize for her actions. Maybe she realizes the error of her ways and is trying to make amends with the ponies of Equestria.
It could also be a minor character who had an unnoticed role during the wedding but later realizes they need to apologize. For instance, a pony who accidentally disrupted part of the ceremony and now feels guilty. This would give the fanfiction an interesting perspective as it focuses on a less - known character's journey of apology during the context of the Canterlot Wedding.
Twilight Sparkle could be the main character. She was deeply involved in the Canterlot Wedding, and if there was some sort of misunderstanding or mistake on her part, she might be the one to offer an apology in the fanfiction.
The 'a canterlot wedding apology fanfiction' might focus on the relationships between the characters. For example, if Princess Celestia or Princess Luna were somehow involved in a situation that required an apology during the Canterlot Wedding. It could explore their feelings of guilt or remorse and how they go about making things right. It could also touch on how the other ponies react to their apology, whether they are forgiving or skeptical.
Definitely Twilight Sparkle, since she is such an important pony in the My Little Pony universe and would likely be involved in any big event like a Canterlot wedding. Fluttershy could also be a main character. Her gentle nature could add a different dynamic, perhaps she's helping with the flower arrangements or calming nervous ponies. And then the two ponies getting married should be main characters. Their love story and the events leading up to the wedding could be the focus of the fanfiction.
It could be a jealous rival of Twilight. Maybe someone who has always been envious of her status and power in Canterlot.
The Doctor from Doctor Who would be an amazing crossover character. He could arrive in his TARDIS right in the middle of the wedding preparations. He could then use his knowledge and skills to solve any problems that arise, like a strange alien invasion that targets the wedding. His time - traveling abilities would also add an extra layer of excitement to the story.
Twilight Sparkle is often a main character. She's the smart and studious pony, and at a Canterlot wedding, she might be involved in making sure everything goes smoothly or solving any problems that arise.
Twilight Sparkle would likely be affected as she is often at the center of things in the MLP universe. Her actions and decisions would be crucial in any alternate ending, whether she's saving the day or facing new challenges.
The wedding itself is a major element. The preparations, the ceremony, and the celebrations. Also, the relationships between the characters, whether it's friendship or budding romances, play a big role in these fanfictions.
In this fanfiction, the idea of Twilight being betrayed during a Canterlot wedding is likely to create a lot of drama. It could involve her friends turning against her or some sort of plot that makes her feel isolated. Maybe it's a miscommunication that leads to the so - called betrayal.
Princess Celestia is also commonly included. Since it's a Canterlot wedding, as the ruler of Canterlot, she would play an important role in the organization and significance of the event. She could be shown making important decisions regarding the wedding.
One possible alternate ending could be that Twilight Sparkle uses her magic in a completely unexpected way to stop the wedding chaos and actually uncovers a plot that was much deeper than anyone thought, leading to a celebration of friendship rather than a wedding.