Sorry for the delay in response, I was travelling back from Europe.
The attributes on the Twitter::User class available for access are:
@@ATTRIBUTES =
[:id, :name, :description, :location, :screen_name, :url,
:protected, :profile_image_url, :profile_background_color,
:profile_text_color, :profile_link_color, :profile_sidebar_fill_color,
:profile_sidebar_border_color, :profile_background_image_url,
:profile_background_tile, :utc_offset, :time_zone,
:following, :notifications, :favourites_count, :followers_count,
:friends_count, :statuses_count, :created_at ]
You can find these attributes declared in the lib/twitter/model.rb
file in the gem source of twitter4r for each model class.
HTH,
Susan