TL;DR - Lovable otaku who works hard and shines bright.
He gets passionate about his interests whenever he gets to talk about them, whether it be his deep love for the beatmania series (or rhythm games in general) or the various otaku references he'll throw in his streams. However, he also has his clumsy moments, as shown during the old OTN-gumi collabs. These were also the same collabs that spawned the #社起きろ /Yashiro, wake up hashtag as when he was hosting the stream, he fell asleep...but still left his stream running. In fact, this happened TWICE.
He has a comforting voice even when he is tired all the time, and when combined with his model, it makes you feel like everything's going to be okay. Whenever he starts laughing, and you see the mouth on his model go wide, it's absolutely infectious. He is known for his helpfulness, as he's been described as someone who can give easy-to-understand explanations and likes to give advice on others' problems. He works hard for his chuuba activities, such as wanting to improve his own singing whenever he watched the 2021 NijiFes performers try their best at singing (which he definitely has, and it makes me really excited to hear what his FOCUS ON! singles are gonna sound like).
There's a comment in his Time Machine cover that perfectly describes the kind of man he is:
(translation) "What I like about Yashikizu is that he is not an unreachable idol or an extraordinary existence, but a "company employee," an element of everyday life, and yet the glimpses of his concern for others and the efforts he has made in the sound game are incredibly cool. He is the kind of "cool person" that you can feel close to you, but you can never find."