[Reeve of shinra]

Wait... are you looking to add an icon next to the username or are you trying to change how the username looks or both?

Just to make your life easy,
1 - create a new product and associate your plugins and phrases with it

2. - create a new plugin using the global start hook location so you can access this anywhere on the site.

3. - look at the postbit template and add your html for the icon there.

ie:

<if condition = listening>
html for listening to radio station
<else />
html for not listening
</if>