Many RPG games use short vocal samples to further the personalities of their characters (Undertale is a great example). A sounds is played as each letter is printed in the dialog box, to better simulate that character speaking out.

As there's a major lack of such audios especially under a free license, I decided to create my own. I used Espeak and Audacity to generate them, and came up with 32 vocal samples in total. This consists of 4 tone sets representing: Standard male, deep male, standard female, light female, demon voice, quick voice, whisper sound, robot beeping.

Designed for the OHRRPGCE RPG engine: http://rpg.hamsterrepublic.com/ohrrpgce