User blog comment:Lady Pisces/Not looking forward to anything anymore/@comment-25600444-20160529102122/@comment-3974145-20160529200758

Honestly I don't wish to touch anything regarding Shido =-= things around him just always happen to be his fault in the end.

As for who we've seen get development? Well actually more then Kazane [though I will admit she got the most of it which was awesome]

Genma got some Character Development with Kemura as we see Genma has taken Kemura more like a pupil to him. Zanya got some character development in Season 1 and then some more in Season 2 regarding his family and his um, girl thing lol.

Tets got some really good development in Season 2 even though it didn't last very long.

Noboru was taken seriously when he came back in Season 2 and got a good amount of development [though yes now in Season 3 all of that has gone straight to his head XD]

And maybe I'm just being optimistic here but development does come in many shapes and sizes. You are right that Kazane is the only one we've "dynamically" seen but as I see it every support character got a little more and more development as they got screentime. So it does show the writers do care about these characters that they will work hard with them when they finally get that chance to show up, it's just the unfortunate deal with Bushiroad and their promotion deals and Main character must win and blah.