The blue rook who has a passion for blueberries! Ruko is known for his beserk walk, crazy talk, and constant trouble-making as he flies high in the sky following the Diddy Car wherever it goes. Ruko is quite a magician, performing endless tricks which delight Nurse Diddy day by day. He believes he is quite the ‘nurse’ himself, nodding ‘knowlingly’ whenever Nurse Diddy gives a diagnosis! He gets bluer and bluer when he eats his favourite snack - blueberries!