What a hero means to you?
Yes, all old Elemental Hero monsters (Destiny Hero and Evil Hero too) have had a retroactive name change. So Elemental Hero Avian is now considered to be Elemental HERO Avian, etc. That means the old E-heroes are compatible with recent GENF cards that look for 'HERO monsters', while monsters like Oscillo Hero do not count, the capitalisation is there to specifically exclude monsters who are not part of the superhero 'HERO' archetype.
i dont really believe that you can just be a hero because you want to be. being a hero involves being selfless. it means that you can think on your feet. a hero needs to earn respect by doing whats right and what the people know is right. and especially make sure that you do something heroic or greeatful.