Kohaku Miyamoto is very timid and stammering, which is surprising due to his tall and thin stature. He's rather jumpy as well and does not do well being touched. He seems to have quite the past but will not open up to anyone about it. Many fans of his current story Neon Boy theorize that he has been hinting at what he dealt with through Kazu's character arc but that remains to be seen. After all, the story is such a departure from Haru No Jinsei, it can't be a coincidence can it?

Kohaku's voice is mid to higher range (with a bit closer to middle), is rather soft and has a bit of a stutter to it. He often trails off in sentences as well. If panicked, his voice can get much louder and shake quite a bit.