The ElggUser entity type represents users within an Elgg install. These will be set to disabled until their accounts have been activated (unless they were created from within the admin panel).
Beyond the standard ElggEntity properties, ElggUsers also support:
name The user's plain text name
username Their login name
password A hashed version of their password
salt The salt that their password has been hashed with
email Their email address
language Their default language
code Their session code
last_action The UNIX epoch timestamp of the last time they viewed a page
prev_last_action The UNIX epoch timestamp of the last time they viewed a page before last_action
last_login The UNIX epoch timestamp of the last time they logged in
prev_last_login The UNIX epoch timestamp of the last time they logged in before last_login