Intentando devolver todas las columnas de registros secundarios para un registro principal

Podrías usar CSV resultado de ID como:

SELECT *
FROM tblreport
WHERE FIND_IN_SET(ID,(SELECT GROUP_CONCAT(lv SEPARATOR ',') FROM (
                     SELECT @pv:=(SELECT GROUP_CONCAT(ID SEPARATOR ',') 
                     FROM tblreport WHERE ParentID IN (@pv)) AS lv FROM tblreport
                     JOIN (SELECT @pv:=1)tmp
                       WHERE ParentID IN (@pv)) a));

Demostración de DBFiddle

Salida:

ID  Name    ParentID
2   2nd     1
3   3rd     1
4   4th     2

EDITAR:

Si también necesita la fila original, puede usar UNION ALL :

SET @var = 1;

SELECT *
FROM tblreport
WHERE FIND_IN_SET(ID,(SELECT GROUP_CONCAT(lv SEPARATOR ',') FROM (
                     SELECT @pv:=(SELECT GROUP_CONCAT(ID SEPARATOR ',') 
                     FROM tblreport WHERE ParentID IN (@pv)) AS lv FROM tblreport
                     JOIN (SELECT @pv:[email protected])tmp
                       WHERE ParentID IN (@pv)) a))

UNION ALL
SELECT *
FROM tblReport
WHERE ID = @var
ORDER BY ID;

DBFiddle Demo2