$aGlobalUser is set in the phpfox.class.php library file. This is just data and has no intrinsic styling.

If you use the |user it is processed by the library template/cache.class.php file down around line 1671 and sets the class to user_profile_link_span near the bottom.

This may give you some ideas to find what you need. I use windows grep and a local folder with phpfox files to do searches. You can usually answer your own question in less than 30 seconds.
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