In that image, I have circled out 7 colors. Those are the palette of the textbox, which means if you change 147B (or either one of the 7 colors) to something else, you'll be changing the color of the textbox. But since you only want to edit the color of the text, you want to focus on the other 9 colors. You notice there are three exceptionally bright colors? They are 3C04, 6406 and 4665. They are also the few main colors that you use. For example, I want a female to use red text, so I use the script command of 3C04, Red - [red_fr] but in your case, let's say you want a female to speak with purple text. So you change the RGB of the red (assuming that you want to edit red to suit your preferred color) to purple: