::I agree with Doniago; using an infobox field to just repeat the article's title doesn't make sense. I think in cases like Carol Danvers, Hank Pym, and Norman Osborn - where the character has multiple alternate identities, none of which clearly dominate the character's notability - we should omit the "alter ego" field and simply put all their alternate identities under the "aliases" field. In cases like Hal Jordan, using the character's main alternate identity (in this case, Green Lantern) for the "alter ego" field probably makes the most sense. 
 ::On a final note, I went ahead and edited Carol Danvers so that her full name appears in the "full name" field instead of the "alter ego" field. I did this without thinking, and I do realize that making such an edit while this discussion is still ongoing is out of order, so if anyone wants to revert that edit they should feel free to do so.