I have managed to edit the relation for the two tables. Also, I have noticed that I did not set the proper FK in place, unfortunately. With that rectified, I have managed to retrieve other data from other models.
public function relations()
$relations = Yii::app()->getModule('user')->relations;
$relations['profile'] = array(self::HAS_ONE, 'Profile', 'user_id');
$relations['biodata'] = array(self::HAS_ONE, 'Biodata', 'user_id');