As Athena already pointed out making a predefined images/graphics for various charactes would be the best solution.
To learn more about this process search the web for "Bitmap Fonts".
Main advantage of Bitmap Fonts is that your font characters can actually be made from different colored pixels.
The main disadvantage of Bitmap Fonts is that in order to scale them nicely you would wanna use several diferent sized images for each characters to not loose to much quality by scaling them.