captainwillies said:
id give hitler the plans for the atom-bomb. because if hitler won australia would be owned by japan meaning id get my manga sooner.
Manga wouldn't exist. At all. You know why? Manga was created after the war, after the bomb hit Hiroshima as a way to quickly get new books out. It was a way to massproduce drawings, that's what caused the distinctive drawing style, it's easy and fast. They were trying to replace what they'd lost in the war with the new form of media.
If Hitler won then that wouldn't have happened. You also don't know what would have happened afterwards, if Hitler and the Japanese won, if they were content with each other or if they would just go berserk and kill each other as well. If Hitler had the plans for nuclear missiles he feels like the guy who could literally bomb Japan back to the stone age. Even if things worked out during the war as you wanted it to there's no guarantee that Japan would keep Australia and that it would receive enough rights for you to be able to get the (still non-existant) manga.
I realize you're not being overly serious, but this is the thing I'm so afraid of, one little "innocent" change can cause so much to happen, so that you'll never get what you really want. Time travel is annoying.