Still need to come up with a way to change this meta data for profiles
Not really clear what you’re trying to change, the head title tag, the members account screens bp_is_user, or members directory page title. As standard BP displays the users name on their user account screens or when you visit another users account, if your site isn’t then that’s a theme issue to ask of the authors.
You could use the below to get names, then what you do with that… :
$bp->loggedin_user->fullname
or
$bp->loggedin_user->userdata->user_nicename / display_name