- Yamaguchi looks unfairly adorable in a beanie - that is all
- Has the best sugar cookie recipe of the whole team - him and Sugawara actually make the team do a blind taste test and Yamaguchi wins. Although Suga was a little dejected afterwards now he insists on them making cookies together for the team.
- Gets nervous ordering coffee
- Is too polite to ask for tomatoes to be taken off his burger/salad/sandwich so he just picks them off afterwards.
- An avid user of apps similar to Snapchat to send things to Tsukishima primarily but also to the rest of the team. He doesn’t like to take selfies but take snaps of things and puts funny/cute captions on them.
- A dog person (particularly large friendly dogs)
- He’s little dramatic when it comes to love. Not in a grandiose sense but more in the oh my goodness she has held my hand- I will marry this person one day sense (like Takeo from Ore Monogatari). He later rethinks these thoughts (or Tsukishima pops his bubble) and gets really flustered.