Based on how it's presented in the wiki, without the number and only year and position listed, as well as the fact that it hasn't been taken down yet, we can assume that's he's a side character who was mentioned in the passing or with a brief showing (like, three panels or something).
I, have watched the anime and searche online for his name but like, there’s nothing (? This is so weird
There is no fanmade page about him yet but he’s a first year spiker in Shiratorizawa Academy.
https://haikyuu.fandom.com/wiki/Shiratorizawa_Academy
Hey guys! I really need your help in searching for a character in haikyuu. I was just browsing through the haikyuu wiki page of Shiratorizawa, then there’s a member named “Yu Shibata”. I’ve read the manga and as far as I know, there’s no member like that. Maybe there is, I forgot about it, or there isn’t. Do you perhaps know?