I really don't see Charlie as a chavvy name. Not in the least. Is your Charlie a Charles shortened to Charlie or Charlie in its own right. And I think he is confident and cheeky, but not necessarily naughty.
(Having just written it so many times it now sounds really weird though...)
Ho! My good man! Please help me down from the carriage and have someone bring in the portmanteaux. And kindly have the Prince informed that his long-lost sister, Lady Hully of Gullington, is arrived and much desirous of meeting him. Her bosom is positively overflowing with sisterly love.