How do I create Character elements?

Character elements are in UPPERCASE and are followed immediately by Dialogue.

Because uppercase text is required for a Character, Character names in Slugline need at least one alphabetical character. So this works:

C3PO
Oh my!

But this doesn't:

33
Hello?

To force a Character element, precede a line with the "at" symbol @:

@33
I live!

Lear about Parenthetical Extensions.