Trash isekai is going to be trash even if you sauté it in butter and sprinkle spices on top, served with jam on the side. Normally one would ask what was the point of making the MC something as inhuman as the spirit of a lake if he's going to register as a human adventurer already in chapter two, but since this is isekai, it's useless to ask questions. This is just the limit of 99% of isekai authors. They couldn't write anything better than this even if a yakuza gangster was holding a gun against the back of their head, demanding something novel.