What do the good/evil sliders do in DeathSpank?

Solution 1:

Move good all the way to the right, and evil all the way to the left to get the "Menu Hero" trophy. Other than that, they are just a joke.

Solution 2:

If you slide the "Good" slider all the way up and the "Evil" slider all the way down, you will unlock the "Menu Hero" achievement / trophy. Beyond that, I haven't noticed any effect on the game.

I strongly suspect these sliders are simply meant make players go "Huh?" :)

Solution 3:

When I slid them around,I noticed the UI and the color of everything that wasnt the game itself change,for example,the menu,if slid all the way to Evil,was all red and the sky was a darker color. If slid all the way to Good,it becomes day and bluish.