Expectations
Kirby knew the huge expectations for him. Everybody turned to him for help. For some reason, he was the only one who could save them.
He was too young to understand that he was the chosen savior of Dreamland, so he sometimes wondered why he was the one people turned to. That thought made confusion cross his mind, and yet he always pushed it aside and did his duty.
Kirby's true maturity wasn't in that he understood people were counting on him at such a young age. It was in that he never cracked under the pressure of it all.