The Characters property returns all the characters in a text range.
Examples:
The following VBA example applies bold formatting to all the characters in the paragraph-text object.
Sub Test()
Dim d As Document
Dim s As Shape
Dim t As Text
Set d = CreateDocument
Set s = d.ActiveLayer.CreateParagraphText(2, 2, 4, 4, "This is an example.")
Set t = s.Text
t.Story.Characters.All.Bold = True
End Sub