BuddyPress.org

In bp-core-classes.php is BP_Core_User

/**

* BP_Core_User class can be used by any component. It will fetch useful

* details for any user when provided with a user_id.

*

* Example:

*    $user = new BP_Core_User( $user_id );

*    $user_avatar = $user->avatar;

*	  $user_email = $user->email;

*    $user_status = $user->status;

*    etc.

*

* @package BuddyPress Core

*/

Lots of stuff in that class. You need a user id to instantiate one.