Chiaki is probably the embodiment of the sun.

He's so cheerful and so full of energy, always breaking the scale and giving way more than his 100%. Truly a man that lives up to his title as a hero.

But sometimes heroes need other heroes too, and Chiaki needs his hero in the mornings; despite his never-ending energy, Chiaki suffers from low blood pressure which tends to be stronger than him in the mornings when he wakes up. He stays in bed for a while, fighting with that ringing headache that has his head spinning as you fill a glass of water for him.