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.
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.
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.
There is often a theme of transformation. Shredder might transform his evil ways, or April might be transformed in some way by her association with Shredder. Additionally, the theme of sacrifice can be present. One of them may have to sacrifice something, like their loyalty to their respective sides or their own personal goals, for the sake of their relationship. And the exploration of the 'otherness' of their relationship, as it goes against the norm of the source material, is also quite common.
One great place to start looking for Shredder x April fanfiction is Archive of Our Own (AO3). There are numerous works there that explore different aspects of this pairing. Some might focus on a more angsty relationship, while others could be set in alternate universes where their relationship takes a different turn.
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.
When writing about Shredder in a TMNT fanfic, you can really play with his character. You can give him new motives or goals that are different from the original. For example, he could be on a quest for a powerful artifact that he believes will make him invincible. His fighting style can be described in great detail, highlighting his skill and ruthlessness. You can also explore his weaknesses, whether they are physical or psychological, which could add more layers to his character and make the story more interesting.
A 'cyber shredder fanfic' could be a fan - created fictional work related to something called 'cyber shredder'. It might involve stories about a cybernetic device or entity that shreds data, perhaps in a dystopian or high - tech setting. But without more context, it's hard to be more specific.
One common theme is the conflict between their two different natures. Shredder is often portrayed as the villain, and Leo as the hero. So, there's a push - pull dynamic of good vs. evil.
It's hard to say. Batman has his intelligence, gadgets, and martial arts skills. But the Shredder is a formidable ninja with his own set of deadly weapons and a whole clan of ninjas at his command. However, if Batman can use his environment and his gadgets effectively, he might have the upper hand.