I'd like to know if there's a way to customize text, like numbers for example, when it's showing the number 1 it has a customized sprite(image).
Well r74 introduced webfonts (how to use your webfont), and new actions to the text object.
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That's not really what i wanted, i took this from google to use as an example: Image Link
I wanted to use text like this.
As Yann said, use the spritefont custom plugin.
I'm pretty sure though there should be a way to turn the image into a ttf font and use the method to make your own webfont and use it in C2.