(this is half a joke and half serious) As a fan of Haikyu myself I have found myself falling in love with all of the characters in the series, there is a wide cast and each character has their own endearing traits, one of the characters that I feel very strongly to and feel extremely passionate about is Goshiki Tsutomu. I feel like his character could be a very interesting one to make a story about. It would be very entertaining to see him raise to be the ace of Shiratorizawa. I think it would be interesting to see how he deals with trying to "live up" to the legacy that Ushijima left. I just really enjoyed his character in season 4 and believe that he would make a good protag, the series in question wouldn't exactly need to be a long one anyways, maybe it could be like the short mini-series like "Land vs. Sea" ok but in all honesty, I just really love Goshiki, okay ty :))