When in doubt, look to
Jojo's Bizzare Adventure for INVENTING the conventions of the Chuuni Genre before the word Chuuni even
existed.
IE. I rank among the special elite of an otherwise normal and mundane world, and I am going to challenge the tyrannical status-quo and make the world fit my vision of Justice with my FABULOUS and Hammy Overconfidence. Nobody else will understand me (hehehe) but I am simply too fabulous and special to give a damn. (Strikes a pose!) 
Note how this applies to EVERY Stardust Crusader in Joseph Joestar's "Band of Light", and
especially to the hopelessly-flamboyant Vampire Dio Brando that they set out to slay (You ROCK Takehiko Koyasu!
)
Lelouch Lamperouge and Tomoe Mami (in confident mode) both fit this too a tee, notice.
