Reply To: How do I display a single user’s avatar with just the username NOT user-id?

Also re. Avatar size, first try adding ‘type = full’ into the array, should allow you to specify larger sizes, as below …

return bp_core_fetch_avatar( array(
  'type' 	 => 'full'
  'item_id'	 => $user->ID,
  'width'	 => 80,
  'height'	 => 80,
  ) );
}