It can be.
"y'know mate, der were ten dings inna dat bag: a book, a knife, a razor, a screw driver, a match book, a rusty old fish hook, a flash drive, a hypodermic with green stuff in it, a solar powered calculator, and a fully charged quantum differential laser guided atomic disorganizer. That proves she couldn't have burned the asteroid."
A colon is typically used to introduce a formal quotation in writing.
A colon in writing is a punctuation mark (:) used to introduce a list, explanation, or quotation. It is also used to separate hours from minutes in time notation.
It will have the name of her character and a colon
A colon. In colloquial writing a dash (--) may be used, but this is not acceptable in formal writing.
The colon (:) is used to separate the hour from the minutes when writing down time. For example, 3:30 indicates 3 hours and 30 minutes.
Use a colon to introduce a list or to connect two related sentences where the second explains or provides more information about the first. A semicolon is used to connect two independent clauses that are closely related in meaning.
A colon (:) should be used to separate the city of publication from the name of the publisher in a bibliography.
When writing times such as, "It is now 8:00." or writing a specific type of list such as, "These are my new books:Gulliver's Travels, The Secret Garden, and Treasure Island." Notice that I bolded the colons. You don't have to when you're writing, but I did so you would notice them. Sorry if this is no help!
To assist in the digestion of harsh vowels.
a colon
The colon punctuation (:) looks like two dots, one above the other. It is used to introduce a list, explanation, or conclusion in writing.
In informal writing, such as a text message or casual email, it is acceptable to use a comma at the end of a sentence in a dialog to indicate a pause or trailing off. However, in formal writing, like academic papers or professional correspondence, it is not standard practice to end a sentence in a dialog with a comma.