Lmao, well it's simple
[Character]
: <--- [Character Speaking or commiting action]
" <--- [Optional: Character Speaking or unknown character speaking]
* <--- [Commiting action]
() <--- [Author notes also may be used as [] or {}]
[Example]
[Character 1]: Hello
[Character 2]: *slaps [Character 1] across the face*
[Character 1]: What was that for!?
[Character 2]: I dunno
"Stand ready for my arrival worm."
*[Character 3] would then be seen floating above [Character 1] and [Character 2]*