You seem to be doing well for yourself in life. So, first off, congratulations on your comfortable salary and relative security. You are well within your rights, I think, to dismiss the reactionary arguments of "you'll never be employed" and "think of your social future," just as the people making those arguments would do well to read the rest of the thread and see that those concerns have been answered, as you say, several times now.
Despite that, I'll be joining the tide of people attempting to dissuade you. More salient are the arguments over the quality of these names. As insults usually only serve to entrench each party deeper in their opinions, I'll try to keep from being caustic. The problem I see with your choices is that you are, by taking any of them as your name, broadcasting to anyone who chances to meet or observe you that the work(s) your name references is, to you, the work with which you best identify, or else is, in your eyes, a pinnacle of artistic expression. They are not the latter. We can, if you really want to, go into why Yu-Gi-Oh! and Final Fantasy 8 have not won their fame as high art, but perhaps my point is emerging? You will be proclaiming yourself as a person of remarkably narrow scope along the spectrum of human expression. I guarantee you that the stories and characters you love in these sources have their sources in the archetypes of far more subtle, nuanced, and ironic stories in the canon of the world's greater literature.
Though this analogy is flawed in a couple ways, I think its underlying point will hold: It would be a bit like naming yourself Morpheus, but because you learned the name from The Matrix.
If you decide to continue regardless, I honestly hope it goes well for you. I do not think we who disagree with you should hope you regret your choice just so we can feel superior.