Pete is Mickey Mouse's arch-nemesis and has been since the 1920s, so there is a lot of history between them. Their relationship is integral to this story. His personality is rude, over-bearing, mischievous, selfish, under-handed and very competitive.

Pete should have a mid-deep range voice, and speak with a little bit of gruff. He doesn't always pronounce 'th' sounds correctly, and will often make a 'd' sound instead. He tends to use a 'th' sound when things get serious though.

As for his speaking pattern, I recommend listening to Jim Cummings' portrayal of him to get a good idea of it, as it's hard to explain in words.