not necessarily. Most people will be wearing their fav manga/anime/cartoon character, but there'll be plenty of people just wearing nerdy t-shirts and jeans or just regular clothes, so no worries :)
no.
a butterfly outfit or a pixie costume
any costume to do with world championship
You open the box or plastic wrap, you take out your costume, and you wear it. Be careful not to have your windows open. Because this is America.
One should wear a maid sama costume and a cute wig that goes with it but not a hood.
A costume. Which costume would depend on which part.
They can wear just about anything.
what attire do you wear for kwela dance
If an individual feels it is right to wear a certain costume, than he or she can. There should be no limitations to what an adult should wear as far as costumes are concerned. For a general idea of what an age-appropriate adult costume looks like, though, check out this site: http://kccbigcountry.hubpages.com/hub/Halloween-Costume-Ideas-to-Wear-to-Work
head wear
If you are going door to door or a costume party-yes.
To be able to wear the Super Moshi costume, you have to participate in Super Moshi Missions. Your monster will only wear the Super Moshi costume when completing a Super Moshi mission.