A couple instances are funny. For example, "aliens from the neighborhood known as Mexico" is hilarious! That was the only thing, though. Remember, Uncyclopedia is very proud of its parodyness, and we don't want any truth in these articles. There are far too many facts in this article. And remember, when making it funny, UN:HTBFANJS is your Holy Bible.
Really, I cannot see why nobody has written an article on Bella Goth yet. She is a very promising character. Once you have it in tip-top form, you can sell it to all your Sims-playing pals.
Prose and formatting:
Eh, it gets a little sketchy. The most foolproof method of checking grammar and spelling is to copy and paste it into MS Word. Oh, and if you are going to do the slashes, make them funny. Human does not really make much sense, now, does it?
Naturally, you would have a picture of Bella. Come on, though, this is the Sims 2! You can make Bella do all sorts of nonsense tricks and take pictures to post. Just go to http://www.thesims2.ea.com and look on the boards for ways to make sims kiss the Social Bunny, walk like ghosts, and much more!
Argh! It's too short! You could go so, so far with this article. If I were you, I would make it like a kind of murder/mystery page. Write it in the style of Casablanca, you know, like from the perspective of an investigator looking into the Mysterious Case of Bella Goth. She can be your typical victim, Cassandra can come in as a femme fatale searching tragically for her mother, and Don Lothario is the big-time mobster. Your investigator can even be Darren Dreamer, if you want to have fun.
It's a start... meaning, you have the topic. That's a huge step in the right direction. But now you need to cultivate it. May the force be with you.