Kai and Hajime at first prefered him as the penguin on the Suica card (a rechargeable smart card that usually used for transportation in Japan) but You said the penguin on the card is an Adelie penguin, not a Magellanic. 
He bowed and gave Hajime a Suica card when they first met. 
Shun accidently slipped his mouth that Magellan was brought from the underworld by him. That explains the reason why he can stand the heat in during August.
You stated that Magellan loves hot springs, and thus love taking a bath together with him.