The Wizard

The Wizard could spawn maybe with a special structure like a Wizards Tower. Maybe he could also spawn with a witch every now and then the magic couple! The Wizard would be neutral and would be rare. A wizard would only attack if you went inside his tower, or if you attacked him. A wizard would have a strong melee hit attack that would be similar in knockback to an iron golem, but instead of flinging you up, it would fling you back. When you are more than 30 blocks away and the wizard is targeting you, he may shoot a beam from his wand at you which does a small amount of damage, but goes through all armor. If you are within 15 and 30 blocks, he may shoot his wand beam, or he may summon a baby mob to attack you. Finally if you are any close than 15 blocks, he would either use one of his normal attacks on you, or he will sprint player sprinting speed to you, and hit you away. If you try to hit the wizard, there should be a 1/8 chance he teleports behind you with a cackle. His tower could also have a couple traps set up, but rewards in the tower could be advantageous items such as enchanted books, or maybe wand shards, where after collecting 6 of them, you could craft a wizards wand. Upon killing the wizard there should be a 1/10 chance of collecting his "Wizards Hat" item, which would mainly be a cosmetic, put wearing it in a storm would up the chances of you getting struck by lighting.