Now before people start going nuts, let me explain.

My favorite female superhero is, and always has been Storm from the X-men.
I love everything about her character, and I would love to make a costume for myself for next Halloween... The only problem is I am whiter than a ghost.

Would it be ok, or even acceptable to get a fake 'tan' or even use darker foundation to make my skin a tad darker, or is that still offensive? Should I just go as normal pale me, or just forgo the costume in general?

As a little white girl myself I would say a little darkening would be fine.
But that's me, a black person could better answer that.

Id go as just pale you.

Black face has always caused trouble due to its roots. Its just as bad as yellow face, or any other kind of racial make up.

You in a Storm suit is just fine. You dont need to become black to channel your favorite hero.

Not to mention Hally Berry was Storm, and she is more of a mocha then black like Storm is supposed to be.

This is true, the real storm came straight out of africa.

You're not talking about "black face".. you're talking about makeup.

Really, I think about black face as someone with burnt cork on their face. not a darkening of skin tone to resemble a fictional character. C'mon.. look at the movies.

Do it.. If any one is offended.. I'll kick their pumpkin carrying asses.

I don't see why not. Just buy a dark concealer and dab it on with those spongy triangle thingies.
dramatic eyeshadow and eyeliner, along with dark lipstick will also help. :)

Yeah, what Kakana and Chez said...
I mean, it's just part of the character, right?
I'd get some dark foundation, ideally from a theatric supply shop, and apply that, then use a dark powder over top.
Ideally you'd cover any exposed skin as well as a centimetre or two of buffer area past that.

As long as you don't do what is normally known as blackface (such as this)
and try to accurately depict what a black person really looks like, I see no problem with it.....but I am white so I may not be the best person to ask.

Yes

<a href='http://www.plime.com/redir.p?http://uk.youtube.com/watch?v=-XHsmRVYU-A' class='plime' target='_blank' rel='nofollow'><b>flash video</b></a>

But only if it's funny enough.

For Halloween costumes, dark makeup is fine. Afterall, its Halloween.

It's halloween go for it.. any black person I know would juSt think the costume is hot b/c I'm guessing storm is gonna be wearing some type of skirt and tights or something(maybe) so I say go for it just dont overdue it.. and Just dont dress up as a ghost:

Just avoid this..