[kirtar]

As broad classifications, every robot should fit in to one of these:
Front Field/Offense
Mid Field/Supply Line
Back Field/Defense
All Around/Some combination of the above.

I see each section of the field requiring a slightly different play style. No matter what, a robot will have to start in one of these and will always spend the match playing in at least one of the areas of the field. Ignoring the ability to hang/elevate, the general roles of the robots before the finale will be offense, defense, and "supply line." It is equally important to be able to defend as to score, but in order to score you must have a supply of soccer balls.

In the back you will want to run into the opponent, and launching the ball is going to be more important, and you probably won't care about avoiding the opponent (you are the hunter). You will want to be able to maintain a pin for close to the maximum amount of time.

In the Front Field you will probably actively avoid the opposing defense. You are the hunted, but you have a target of your own. I think some method of herding while possibly the ability to possess/launch a short distance will be important. Mobility here will be important to avoid a pin, but escaping a pin may also be important.

In the mid field, you will need to do a little of both. You will track down the other supplier if you want to deny the supply of balls to the opposing alliance. You will avoid them when you are going to supply your offensive bot. I can see robots that are built for this task being able to be effective on every area of the field.

BTW, the directions are kind of reversed since your goal is toward you and not away from you.