WP User Info in bbpress

Okay, one more try now

There is one thing I want do do, so I have 2 questions according to that:

1.) (how) is it possible (I guess it is) to get WP userdata for display in bbpress? Lets say the First Name of the WordPress User Information.
Must be something get_userdata( <strong>bbpressuser</strong>) ?!

2.) As I learned, the Userinfos (Avatar, Role etc) of the Reply must be somewhere in loop-single-topic.php – but I really don´t find it.

Thanks in advance. Hope someone can help with that for the german forums (i´m from germany) are really dead :/

Best regards
Apokh