He was stuck-up and thought that he was always right - and was always portrayed as being the smartest and wisest, since Kobayashi favoured him. If he learned in an episode not to misjudge others, by the next episode he'd revert straight back to type, and the show would still tell us he was in the right. That's why I never liked him, and unfortunately, I get the nasty feeling of Yellow being another him (or Mako, or Airi, who are the same character type.) Why not give us another Kotoha/Hina? They were "reliable", and I loved them