Well, our leadoff hitter is the guy with the best on-base percentage, and someone who can really run the bases well. #1 has to be a run scoring machine. Our #2 has to be able to consistently put the ball in play, hit to the right side, be an excellent bunter and somebody who can also run well. #3 is simply the best hitter on the team, hits for high average, power and drives in runs. #4 is a big power guy, and someone who will drive in runs consistently. #5 hitter is a lot like #4 but usually a bit slower runner. #5 has to be able to protect the #4 guy. #6 hitter, I want someone who gets on base consistently, has some ability to drive the ball and is a good baserunner, sorta similar another #1 or 2 guy. #7 & #8 are usually filled by hitters who aren't the best option at one of the other lineup spots and my #9 hitter might as well be another #1. I will frequently put the slower runner at #7 and the faster runner at #8 to not be as likely to clog the basepaths for #9 & #1. #9 has to get on base with regularity and run very well.
The #5 hitter is one of the main run producers on the team. On our 18u team the last two years, the usual #5 hitter was a 6'4" kid who played in the Area Code Games, so that'll tell you what we think of the #5 hole.