Luke
Luke is an all round hero with decent health, able to block and decent speed along with a rush ability. He is very mobile by using rush and a mixtures of doges with force jump to dodge opponents. His force push is one allows you to easily knock over enemies and acts as a slight range attack. This is great for a group of enemies. This should do half of a regular soldiers health so you can finish it of with a rush attack for a quick kill. This is also incredibly good on heroes as you can get some easy hits on them when they are knocked down as well as knock them back so that you can escape. You should also use this near ledges that you can knock people of, so that you get an easy kill, especially in Heroes vs Villains. His rush ability allows him to rush forwards while doing an attack which is great for rushing through enemies after a force push or rushing through them and rushing back through them. You can also use this for escapes and getting behind an enemy. I would block until the enemy's blaster is overheated then rush in for an easy kill. His repulse ability allows him to push everyone back around him dealing decent damage. This isn't as useful as a force push as it leaves you incredibly vulnerable as it has a big animation. But against another hero in a 1v1 I would knock them over with force push and keep them down with repulse for some easy damage. It does work on groups of troops as well but flank them first or attack while their distracted as you can easily lose half your health very quickly.