The main characters in sakura clan massacre fanfiction can vary widely. One type is the lone warrior who has a personal vendetta against those responsible for the massacre. They are often highly skilled in combat. Another is the healer - type character who tries to mend the broken community after the massacre. This character may have some kind of magical or medical ability. And then there are the traitors. Sometimes, there is a character who was once part of the Sakura clan but betrayed them, and their actions are a key part of the story as they are either redeemed or face the consequences of their betrayal.
In sakura clan massacre fanfiction, a main character could be a young member of the Sakura clan who has some special ability. This character uses their power to try and figure out what really happened during the massacre and to take revenge. Another common main character is a detective - like figure from outside the clan who gets involved in the mystery of the massacre. They might be motivated by a sense of justice or a personal connection to the Sakura clan. There could also be a mentor - like character who guides the younger characters through the difficult times after the massacre.
Often, there is a survivor of the Sakura clan. This character is usually on a quest for justice or revenge. There might also be an antagonist, perhaps the one who instigated the massacre in the first place.