They are not actually making one female, but adding a new female character - but I don't like the idea of that either in their case. It's not as if I'd be happy with every story I read or series/film I watched had only white male characters - but I really don't think the Impossibles will be improved by having a token female! Do you object to Josie and the Pussycats being an all-female band?Why is making one of them a woman in any way spoiling them?
Do you realize just how selfish and shallow that post is?
And while 3 white males in one cartoon is inconspicuous yes, it becomes an issue when the vast, if not overwhelming majority of characters are white males, it becomes an incredible oversight - so something has to give.