CCTextRangeColorer

CCTextRangeColorer is a CCTextModifier that colors text characters in an alternative color if they fall within a specific range. Assign it to a CCText component to color its contents.

You can create one via Assets / Create / Text Box / Range Colorer.

colored text inspector
range colorer, making 'a' through 'm' green
You can check the ASCII codes for printable characters to see how characters are grouped into ranges.