I noticed that a wiki page was created for ultimate imposter. Is this term spelled "Imposter" rather than the more common "Impostor" in the official English version of Danganronpa 2 itself? I did not play the game far enough to see it come up.
Google has more hits for "Ultimate Imposter" suggesting this is probably the case, but there are plenty of results for both.
If this is the official spelling I suppose the tag ought to be left as is, but if not I'll correct it.
