HTML Markup

[DAMINK]

Hey guys and gals.
Just a quick question i hope someone can help me with.
I want to make some fancy usernames for some members of my forum.
Now as it currently stands we cant really use html markup for it based on character limits.
So i resort to using additional css which works well.
However how would i go about changing each letter of someones name?
Now obviously this will not fit in html markup. (prob not the correct code either just an example really)

<span style="color: rgb(255, 0, 0);">D</span>
<span style="color: rgb(204, 0, 0);">A</span>
<span style="color: rgb(153, 0, 0);">M</span>
<span style="color: rgb(102, 0, 0);">I</span>
<span style="color: rgb(51, 0, 0);">N</span>
<span style="color: rgb(0, 0, 0);">K</span>

So how exactly could i do this with additional css?
Can it even been done through additional css?
Any help to point me in the correct direction would be great.