It's okay if your character corrupt, as it doesn't negatively influence your ending. Unless... It's dark brethen one, where you did false founder mask scenes.
Overally... You should go first for blue arrows. Dark brethern route is the easiest one, because enemies here doesn't have as much lvls as in demon lord ones(9999lvls at the end).
From the start of the game, use tents at every moments, after you fill 4 slots for teammates. Which means you follow a bit that femboy guy and then follow blue arrows, until you reach a church or whatever it's. You get here Shunka. Tents lvls up you for free. After that, i recommend you to put on auto or use cheat engine to speed up farm. Because you will need quite a big lvl. Of course you can simply not farm mobs that much, while following blue arrows. But you might find yourself in difficult situation. In that moment, it's better to look at your inventory and enchance weapon. What is that? You will ask me and i will show you this
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It allows "rare" weapons to become very very strong. Or you can use recent equipment... Though, it's not really good most of times.
Also i forgot to say about equipment, which increases your stats for simply moving through locations. It's nipple suckers or any equipment, including personality. All of them can give you free stats. They albeit annoying sometimes, but they do help a little bit, at the start of the game.