Is there any way to set certain colors to certain letters in MS Word?

There is actually...

With your document open press Ctrl+H to open Find and Replace.

in the find and replace text boxes simply enter the same letter that you want to modify.

ex.

Find what: A

Replace with: A

Click the button that says 'More >>"

Click inside of the 'Replace with' text box and now at the bottom of the window choose the 'Format' button.

Choose Font from the menu and now change the font color (red for example) and click OK

Below the 'Replace with' text box it should now say Format color: Red

Click Replace All and it should work :)

This worked for me so I hope I made it clear enough. You would need only repeat these steps for each letter and color you want to change. If the case is important the options include a check box to match the case only before you choose replace all.

Um.. Is that ^^^ an advertisement???

Anyway... Do you want those letters TO always be colored??? or do you want to color them as needed???

If you want them to always be colored then you would have to create a VB add-on to do that...

If as needed, just highlight the letter and color it individually