Any action figure will work as long as its bottom is larger in diameter than your model rocket engine. I like to use the smallest model rocket engine I can so that I have more options with what action figure I use.( Im not pejuicedest against action figures).
Step 2: The rocket
Once you have your figure drill a hole the diameter of the rocket engine in the bottom of it. That hole is where you put the engine when you luanch it. Now drill a 1/4 centiameter hole straight through the action figure.
Step 3: The last stage
before you luanch this off bend a coat hanger into a straight line. when you luanch this off make sure to stick the coathanger into the ground and put the coathanger through the 1/4 centiameter hole and then you can luanch it off