-He bathes with his swimming trunks on.
-Haruka will go anywhere as long as there's a body of water that he can get into.
-Haruka has exceptionally great art skills, such as drawing and wood carving.
-He has a certain romantic attraction to water.
-If Haruka was a girl and he had to date one of the boys from the Iwatobi Swimming Club, he would choose Makoto because it was the easiest choice. However, his choice was quickly changed to Nagisa when the first year promised to cook him mackerel for breakfast every morning.
-Haruka and Makoto appear to have a game that consists of Makoto guessing what Haruka is thinking.
-Haruka once wore a girl's swimsuit in elementary school. Nagisa borrowed his trunks because the blonde's sister swapped out his swimsuit for a girl's one. Haruka claims that he had no recollection of this memory, but shows that he does at the end of the track
-Haruka's best subjects are Home Economics and Art, while he's bad at English.
-Haruka likes cooking and doing chores.