Well, here are some anime/gaming theories that I know about but don't plan on writing a post about:
- ONE PIECE: Trafalgar Law is a Marine theory! This theory is actually convincing despite being told again and again that he's a pirate in the story. The author loves to mislead us without outright lying, this actually a theory that I hope turns out true.
- Final Fantasy VIII: Squal is Dead theory! This explains multiple weaknesses of the game's story by assuming the main character died at one point in the game. The rest of it being a dream. This theory was proven wrong by the creators. The story weaknesses are actually bad writing mistakes. Still a fun theory though. I might write about it in the future.
- Hunter x Hunter: Kurapika Will Die theory! The author said when asked what's the future of Kurapika and his enemies the Phantom Troupe, he said "All of them will die." Multiple fan-thories of how Kurapika will die before the end of the series emerged. Since it's on Hiatus we don't know for sure.