1 — his name, 日向 創, translates to sunrise! as best as i can tell at the very least, trying to find english language meanings of kanji when used in names specifically can be quite hard. if i'm wrong, or there's an alternative translation, shoot me an email!
the 日向 (hinata) means sun, sunlight, or facing the sun, and the 創 (hajime) means to open, or to begin. the beginning of the sun! i think it's very fitting for who he is, and what he represents.
2 — nekomaru thinks that hinata would be good at rugby !! it's in his second free time event. the direct quote is:
"Your calm judgement skills, your high degree of mobility... and you obviously know the importance of teamwork. You may very well be a natural on the rugby field."
he also notes in his report card after the event, "After assessing my body, Nekomaru said I would be an amazing athlete if I worked out more."
3 — if you click on the shower in his cabin he says in internal narration that he's "never been able to wash himself comfortably" before immediately backtracking with "well, not in this kind of situation at least."
he just needs the player to know he does usually bathe, actually. however, he doesnt usually shower as he also has dialogue saying he doesnt like to shower specifically.
these are directly transcribed from my blog, but eventually i'll add even more here!