Zenshin
He likes rock music a lot but he's also a fan of very traditional music as well. If it's the right song he's been known to sing along to it.
The usual things go through his head before falling asleep. Mostly double checking his schedual for the next day mentally. If he's had a rough day before bed though he'll often go over that in his
He's not driven by sex like some other guys. He's DEFINATELY interested but it doesn't take up his thoughts all the time. He actually lean more towards the love spectrum of emotions and enjoys the warmness of relationship. He likes to show he loves her with little things. Doing things for her, little kisses anywhere but on the lips (usually on the forehead or on the cheek). He believes that you don't need to say the words all the time but you need to show it everyday.
Uh random...random.... He'll always be close to Tegatai and I headcanon that the two of them secretly hope their kids will all be besties too.
He's turned on by subtlety. Coyly coming on to him gets his attention but he really likes when he's softly touched along his jawline. He's turned off by bad breath oddly enough it's small but it really shuts him down.
Rinzu
She was such a busy child! She was literally all over the place and constantly getting into everything! She used to get into her mother's jewelry and parade around in it pretending she was a model XD
One of her favourite items is a necklace her dad brought back to her when he returned from his travels. It came from Suna and it is a delicate necklace the chain in gold and it has three charms on it. One is of the sun, the next is of a crescent moon and the last is of a bird. She got it when she was 10 and she hangs onto it as a very precious treasure for her.
Her bedroom is pretty lavish actually. She's a huge fan of rich colours so her bed is adorned in burgundy and royal purple. Queen sized bed for the queen (of course) which is pushed against the wall to save space. She has heavy curtains to block out the morning sun but she keeps them open the majority of the time. She has two dressers, one doubles as a vanity/makeup stand and everything onto is precisely placed. She's a little finicky about keeping that stuff organized.
Friends for Rinzu I see them having to be just as high energy as she is. Shy people or anti social people just would not get on with her that well.
Tegatai
He likes to relax by tinkering with Sahou and Uhen his puppets. Making modifications on them and or repairs helps keep him calm and takes his focus from the stressful things.
Other then his nervousness he doesn't have many others that would be notable, but he's DEFINATELY aware of it. He's pretty embarrassed of it actually.
God, he HATES it when Zenshin teases him about Shizune. He cants stand it when he brings it up because he feels so exposed when he does that. Zenshin really does live up to being his brother from another mother cause he does a good job on getting under his skin about things he knows irritate him.
Tegatai gets way excited when he finds new tools or things like that. He has a big collection of handy work stuff so when he finds something new or something he doesn't have he gets really excited and must have it!
Enjoyed reading all of them! I really would like Rinzu's bedroom and I always like learning more about Zenshin and Tegatai's relationship 
And here's some more questions for them when you have time~
Zenshin
It's kind of awkward - what subjects are likely to make your character hesitate, flush, stumble on their words, etc.?
Describe the character's favorite possession. Where did they get it, and why are they so attached?
What makes them feel safe or secure? What makes them feel insecure or unsafe?
Main personality traits. Positive ones, and negative ones.
Rinzu
Which one of the five senses is most important to them?
What is the most imperfect part of this character's body? (Or what body part she feels like it is, if she has any.)
How does your character prepare for bed? Do they sleep at all or can they stay awake for days on end without trouble?
What is one thing others might find intolerable about them?
Tegatai
Which one do they prefer; knowing when they die or how they die?
What would hurt this character so badly they couldn't even breathe?
Do they prefer sweet, salty, sour, meaty, spicy, or neutral tastes?
What are the character's three clearest memories?
And here's some more questions for them when you have time~
Zenshin
It's kind of awkward - what subjects are likely to make your character hesitate, flush, stumble on their words, etc.?
Describe the character's favorite possession. Where did they get it, and why are they so attached?
What makes them feel safe or secure? What makes them feel insecure or unsafe?
Main personality traits. Positive ones, and negative ones.
Rinzu
Which one of the five senses is most important to them?
What is the most imperfect part of this character's body? (Or what body part she feels like it is, if she has any.)
How does your character prepare for bed? Do they sleep at all or can they stay awake for days on end without trouble?
What is one thing others might find intolerable about them?
Tegatai
Which one do they prefer; knowing when they die or how they die?
What would hurt this character so badly they couldn't even breathe?
Do they prefer sweet, salty, sour, meaty, spicy, or neutral tastes?
What are the character's three clearest memories?
Zenshin
He's likely to get embarrassed and flush when he's speaking about his heart troubles since its viewed as a bit of a disgrace to him and his clan. He doesn't stutter too often honestly. Other then that I can't think of too much that would make him hesitate. Well he did a lot of hesitating when he first started dating Akina XD oh....yukata and kimono...that always gets him XD
His favourite possessions are his musical instruments that he's collected over time. But his most favourite out of all of them is the flute he got in taki during their honeymoon because it's sentimental to him. And the koto he has which was the very first instrument he acquired and above all, he enjoys the sound of a koto most
He feels most secure when he's working. He's confident in his abilities so it makes him feel secure when he's working at least he knows he's good at that. The hospital makes him feel insecure and unsafe given his many times he's had to go in for treatment.
+ protective
+ kind
+ hard working
+ thoughtful
- self critical
- Bit of a workaholic
- Over zealous
- Prideful
Rinzu
DEFINATELY the sense of touch is most important to her. She's sensitive to the feel of things wether she's working on making something, the sensations of certain fabrics or anything else really.
Bust, waist and legs are what she feels are her best assets XD
Rinzu has a bit of a bedtime routine. She'll wash her makeup off and wash her face then put some moisturizer on. She usually ties her hair back in some way too yo avoid a beehive hairstyle in the morning. She's a good sleeper at a usual 7-8 hours a night but it's rare for her to sleep in
She has a superior attitude sometimes and it annoys quite a few people. She sees it as confidence while others see it as a higher then thou attitude.
Tegatai
He'd rather know when he's going to die instead of knowing how. He doesn't want to know the details XD
If something happened to one of his kids or Shizune it would cripple him. Nothing means more to him then his family
He prefers salty flavours and he can't stand spicy food.
His first clearest memory is helping his older brother with his puppet before he passed away. The second is the day he met Zenshin during the Chenin exams. And the third is the first time he met Shizune. Only got a look at her and didn't even talk to her but he knew right away he wanted to get to know her.
Omg what made him hesitate when they were dating? XD is there anything Rinzu doesn't like in terms of her looks? Also what made Tegatai be drawn into Shizune?
Mostly he didn't want to say or do anything stupid in front of her XD so he weighed everything in his head carefully first XD in terms of looks? Rinzu isn't thrilled with her hips, she thinks they're too wide. Aaaaand Tegatai is drawn to her by her looks first off but when he gets to see her in action medically by chance he's more impressed with her intellect