There's no way to tell for sure who the main characters in 'legacy undone fanfic' are without reading it. But generally, in fanfics, they could be a mix of beloved characters from the source material and new characters introduced to drive the plot forward. In this case, if it's related to a detective - themed franchise, the main character could be the famous detective whose spotless reputation (legacy) is being smeared, and there could also be a new character, perhaps a young journalist, who is trying to uncover the truth behind the undoing of the detective's legacy.
I don't have enough information to know the main characters in 'legacy undone fanfic'. It could be original characters created for the fanfic or well - known characters from the original work that the fanfic is based on.
As I've not read 'legacy undone fanfic', it's difficult to say who the main characters are. However, if it's a fanfic based on a popular book or movie franchise, it might feature the main protagonists from that original work, but with their legacies being put in jeopardy in new and unexpected ways. For example, if it's a Star Wars fanfic, it could be Luke Skywalker or Princess Leia, and the fanfic could be exploring how their heroic legacies are being challenged.
Chapter 245, "More Than Meets Your Match!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Yan became even more smug upon hearing this.
Chapter 372, "Finish the Wine and I’ll Let You Leave", is the clearest early answer because it turns Vajra Relics's situation into a concrete plot event. The chapter gives readers a real answer by opening on Jin Si Yue suddenly realized that his wrist was back in proper...
Chapter 430, "I Quit", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Hey, do we join a team that's short on members, or do we form our... and closes on You still have time to quit." "Who said I was quitting?" Jiang Li....
Chapter 605, "The Plan to Surround and Annihilate Team Q Commences!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The thirty-odd people lurking by the shore were just like today's...
Chapter 515, "You actually kidnapped a man?!", is the clearest early answer because it turns Ren Yue's situation into a concrete plot event. It opens with After Miss Su Yinwan left in a huff, Shang Shuyue's mood greatly...
Chapter 471, "This is What Happens When You Abandon Sister Li!", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. Early on, Seeing the thick wooden stakes Jiang Li had brought down, Yu Li....
Chapter 599, "The Weather has Cooled Down, the Merchant Should Go Bankrupt", is the clearest early answer because it turns Dragon Ridge Island's situation into a concrete plot event.
Chapter 272, "Jiang Fugui", is the clearest early answer because it turns Lin Manru's situation into a concrete plot event. The chapter gives readers a real answer by opening on Lin Manru held the phone for a few seconds, expecting her daughter...
Chapter 253, "She Hit My Head Three Times, I Hit Hers Seven Times", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event. Early on, Wen Jiaojiao immediately lost her composure, leaping up from the bed....
Chapter 366, "The Safety Lock Got Flattened?!", is the clearest early answer because it turns Got Flattened's situation into a concrete plot event. Early on, You're finally out!" Xiao Wu saw Jiang Li and the others from a....