Capital Letter After Colon American English. Don’t add anything else to a sentence after you’ve finished introducing the element(s). The bumbling wizard rincewind is pratchett's most popular character.
The use of a capital after a colon (:) varies depending on whether you are writing in british or us english, just as the spelling of 'capitalisation' and 'capitalization' are different in british and us english. The capitalization rules for titles of books, movies, and other works vary a little between style guides. A colon is not normally followed by a capital letter in british usage, though american usage often prefers to use a capital.
A colon is nearly always preceded by a complete sentence;
But sometimes, out of the blue, you notice an author does capitalize after a colon. Colons can take a bit of practice, so try using one (or more!) in the next piece that you write. If the introductory phrase preceding the colon is very brief and the clause following the colon represents the real business of the sentence, begin the clause after the colon with a capital letter: In british english, the first letter after a colon is capitalized only if it’s a proper noun or an acronym;