What if TenTen isn't (I have no idea if this is fanon or canon, BTW) Yong? What if she, Iruka, and possibly Shikamaru are actually the descendants of those who originally inhabited the land where Konoha sits?
What if under Konoha, unknown to any who aren't aborigines, there are extensive catacombs holding traps, treasures, the dead of thousands of years? What if it was from them that the whole Clan thing got started? What if it was from them that the Clan tattoos got started? What if the leaf symbol is based on the original inhabitant's form of written language, pictionary (or perhaps logographic- think Egyptian heiroglyphs) in nature? What if the entire nature of jutsu was based off of the aborigine's native arts? What if the aborigines were all but forgotten, so forgotten that they are no more than a distant dream? What if the dogs of the Inuzuka clan are the descendants of the original aborigine's dogs, who were so fierce and large and loyal that even Akamaru would be nothing next to them?
What if, to protect the village, the descendants could call on their ancestors? What if they could bring the dead to 'life'- zombies, maybe- to protect them and theirs? What if the huge, fierce dogs were merely sleeping, deep in the catacombs, for when their masters would need them once more? What if that jutsu that can reanimate the dead is based off of the aborigine's jutsu, except that the aborigines don't need complicated hand symbols or anything- just to be of the blood and have great need. A child who had fallen and skinned their knee wouldn't be able to summon the dead or dogs, for example.
What if the descendants finally grew tired of being ignored and decided to display what they were? What if, instead of TenTen of no last name, she were TenTen of Brightmetal or Longknife, or whatever? What if the descendants chose to tattoo themselves with what were once their clan symbols?
What if some of the other ninja accidentally broke into the catacombs, perhaps while training? How would they react? Would the guardian dogs wake and brutally attack any non-aboriginal nin who dared to try and enter?
This is all a very weird sort of fic-baby I'm thinking of writing... all hypothetical, though. Can anyone tell me if it sounds interesting, or enlighten me on some things?