Ahem. Some of you may see this coming if you know me. Those who don't... bah! Where have you been living that you don't know me? The Marianas Trench?!
Jestful raillery aside, the greatest superhero is, without a doubt,
Lina Inverse from the manga (and anime) series
The Slayers!

(
Lina owns you!)
Ah he ha ha ha... I can hear the cries of 'foul' and 'boo' already.
Why do I pick her? Let me list the reasons.
She is young. Even at such a tender age as, oh, fifteen-sixteen, she is
very smart, has a good head about her (in terms of common sense), and does she control a vast amount of magical power! The latter was learned and gained only through the pure drive to be the best, the most powerful, and an inferiority complex developed during the ten years she lived in the shadow of her 'perfect' sister. Sorcerers are cool, too...
Her attitude towards life is to live it and continue living it despite what happens. Even if something terribly grim happens (like big bad dude Ruby-Eye Shabranigdo's resurrection), she just picks up the slack where others have left it, and she challenges to do something which she is not even sure that she can do. Her will is amazingly powerful, refusing to give up and all that. She has her dreams to live a lavish and famous life, after all.
Along with her zest for life comes a zeal for food. I have to like a character that I can compare with... I'm a huge food enthusiast. Whenever I have the chance at foreign cuisine, I'm there!
She's not morally uptight, either! I've grown to dislike heroes who are, like, 'justice must prevail!' and all that stuff. She's kind of a quasi-hero, and only to those that know her. To the general populace, her name is likened with 'The Enemy of All Living Things' and 'The Girl That Leaves Destruction and Terror In Her Wake.' In reality, she contributed to the halting of Shabranigdo's return to power, the destruction of Gaav (a very powerful Mazoku -- a servant of darkness and chaos -- in her world), and the destruction of Hellmaster Phibrizzo (ditto, but more powerful than Gaav). She did not do this alone; another thing I like about her is that she knows her limits and gets help when she needs it.
Not being the goody two-shoes person that I dislike, she makes a living out of 'bandit killing.' This involves tracking one of multiple bands of brigands, thieves, bandits, rogues, etc.; thrashing their camp, killing the leader, scattering the members, and taking their loot for her personal use. She figures that spending the riches the bandits stole will put the money back into the economical circulation between merchants and countries, so she's servicing both the public and herself at the same time!
Of course, that is just an excuse. She tends to be coarse in her language (though not
too coarse), greedy, self-minded, and selfish. In the end, though, she has the best interest of humanity (the good part, anyway) at heart.
The facts that she is a GIRL (a redhead, at that) and has one hell of a snappy fashion sense (I LURVE asymmetrical!) round out my reasons for loving the Sorceress Supreme, Lina Inverse!
As a sidenote, I plug my fanfic-in-progress of The Slayers' descendants here. XD
Slayers Forth!
If you read it, review it, damn it! >:O
DRAGONNNN SLAAAAAAAAAVE!!! *BOOM!!!*
-EXCERPT-
"So, do you know the meaning of overkill, Rina?"
I recall how I've heard that one too many times as I give Judas an angry stare. "Shut up!"
-END EXCERPT-