My favourite comic book character would have to be Batman!
His indomitable will and his incorruptible sense of morality was forged by his dark past. Of all the possible outcomes, he chose to set out on the path to do good, and devoted every bit of himself to the cause he believes in. I find this very inspirational and it gives me an ideal to strive for when having persevere through a difficult situation.
He's also a genius, mastered every martial art on the planet, is in peak human condition (speed, reflexes, speed, endurance, agility,) is an expert acrobat, is able to use the power of intimidation effectively. Despite the minuscule odds of becoming Batman in the real world, writers are still able to make him a relatable character. That's why he is my favourite.