How to get red power bricks and characters that are evil?

Red power bricks are a bit like minikits, but there is only one in each level. You need to search each level to find them and when you do, finish the level and then go to the canteena. At the main place in the canteena you will find a box called extras. Press A on that and you will see all the red bricks you have found and what they do. If you want to buy them press A on it and you will have it. Now get out of that and press start. It should come up with Resume, Extras, Options and Exit. Click on Extras and some of the red brick powers that you have bought will show up for you to turn on. If they don't, then it means that the one you have bought automatically turns itself on. ---- To use the dark side,you can either make a dark side character in character customization (to do that you just need to give it a dark side lightsaber)or you can wait until you battle or see a dark side character in a battle, then you need to go buy it at the canteena. Sorry it's pretty long but hopefully it will answer your question.