Avatar: Guardian of the Sea (AU)

After dying from COVID, Oliver never expected to wake up again. Especially not in the world of Avatar: The Last Airbender. Reborn among the people of the Northern Water Tribe, Oliver soon realises that this second life comes with a strange advantage. He carries faint memories of the world's future. Unfortunately, it has been years since he watched the series in his previous life, and most of the details are hazy at best. Still, he remembers enough to know one thing. The Fire Nation's shadow is coming. Rather than sit back and watch history unfold, Oliver decides to act. Whether through waterbending, knowledge from another world, or sheer determination, he will carve out his own place in this era. And if protecting the Northern Water Tribe from the Fire Nation becomes his role in this new life, then so be it. What to expect:  - no harem - OC main character  - weak to strong  - Not just following the original story. Extra stuff too - a tiny addition from a different franchise (not naming due to spoilers, but the addition is an animal companion)