The sun is a very threat to your existence. It wouldn't feel good.I think the whole LG drow paladin of the sun is a great story. Imagine living in darkness your whole life and then, after a harrowing journey upwards, you stand in a cave mouth and see the sun in all its glory, feeling its warmth wash over you, tears flowing because the sight is so beautiful to you and your eyes are super sensitive to sunlight. That's a great story and I'd be perfectly fine with a LG Drow paladin devoting himself to worship of the sun/sun god.
But that is beside the point, why a Drow? Why not any of a myriad of other races?
1. To be the centre of attention.
2. To tell a story to a captive audience rather than to create a story with friends.
It's just disrespectful. At our table we don't allow any of that sort of thing. You're here to contribute to the group or you should go write a novel on your own.