One common theme is redemption. Many fanfics explore the idea of Shredder seeking redemption in April's eyes, like how he might try to atone for his past wrongs. For example, in some stories, he protects April from other threats, which is a way of showing his change.
Another theme is the power of love or at least a strange attraction. Since they are on opposite sides in the original story, the idea of them having some sort of feelings for each other, whether it's a full - blown love or just a magnetic pull, is often explored. It's an interesting dynamic as it goes against their typical adversarial relationship. Some fanfics build entire plotlines around this concept, with their relationship being the central focus and the source of both conflict and resolution.
The theme of transformation is also quite common. This can be both physical and mental transformation. Shredder might transform his ways, or there could be some sort of magical or scientific transformation that affects their relationship. For instance, a fanfic could have a scenario where Shredder is cursed and only April can help him, which forces a change in their relationship and their individual characters.
I'm not sure specifically as it could be about many things. 'April' might be a character name, and'shredder' could be some kind of entity or character too. A 'fanfic' is a fan - created fictional story, so it could be a story created by a fan that involves these elements in some unique plot.
One great Shredder and April fanfiction is 'The Unlikely Alliance' which explores an alternate universe where they have to team up against a greater threat. It has some really interesting character development for both of them.
You could start by looking on popular fanfic websites such as Archive of Our Own (AO3) or FanFiction.net. Just search for 'april shredder' on their search bars and see if any relevant fanfics come up.
Since we don't know the exact nature of 'april baby 30', it's a guessing game. But some possible themes could be related to growth. Maybe the 'april baby' is a character who is developing over time, and the '30' could be related to some sort of milestone like age or days passed. So themes like maturing, facing challenges as one grows could be present.
One common theme is the clash of cultures. The modern Twilight characters with their unique natures (vampires, werewolves) in the more traditional 1912 setting. Another theme could be love in a different time. How the relationships, like Bella and Edward's, develop within the social norms of 1912.
Adventure is a theme that frequently appears in april jackson fanfiction. She could be on a quest, exploring new places, or facing challenges that test her courage and skills. This type of theme makes the stories exciting and full of action. It allows the writer to create unique worlds and scenarios for April Jackson to be a part of.
Love and attraction is another common theme. Writers like to explore the budding romance between them. It could be a slow - burn kind of love where they gradually realize their feelings for each other. Sometimes it's shown through their small gestures and glances.
Love and family are very common themes. The fanfictions often explore how Jackson and April's love for each other deepens as they become parents.
One common theme could be the reactions of the Turtles. They might be protective of April. Another could be the challenges April faces during her pregnancy in a world full of mutants and danger.
One common theme is the 'opposites attract' idea. Donnie, being the scientific and often introverted one, and April, who is more of an action - oriented and outgoing character, their differences draw them together in many fanfictions.