Hunter x Hunter
DescriptionI got into Hunter x Hunter about half a year ago, and I'm surprised I didn't pay attention to it earlier - it's an amazing show with wonderfully developed characters and interesting writing. (Pity the manga is eternally on hiatus...)
Construction details here: http://shounenalice.tumblr.com/tagged/kurapika-cosplay (it'd be way too long to fit in this box).
The best part was I managed to convince three other friends to get a full protagonist quartet together! :)