Marvin Acme is like the late, great Billy Mays of the gag world. Remember Billy Mays, the guy who pitched everything from Oxi-Clean to KaBoom? (A great name for an Acme product, btw.)
Acme's the man behind all the greatest cartoon gags: reusable holes, mallets with boxing gloves in them, and his famous disappearing/reappearing ink. Wile E. Coyote alone could keep Acme in business.
But the businessman has a bit of a dark side. He enjoys playing patty cake with another man's wife. That's mostly harmless, right? A victimless crime?
Acme offsets his slightly sleazy side with his philanthropic side. For some reason, Marvin Acme owns Toontown, and he plans on bequeathing it to the Toons in his will. The problem is that he wrote the will in that disappearing/reappearing ink, causing it to be lost for most of the movie. Acme is a guy who never takes anything seriously, and that sometimes brings harm to others.