hikaru zaizen

This is a thread simply for the issue of Characters that seemed awesome but have been forgotten or left behind and other queries. To begin with, the likelihoods of Zaizen, Yushi, Jirou, Hirakoba, Ibu, Kamio, Sengoku appearing again? The likelihood of High Schoolers that have been defeated...

Over the past few months we've seen Krauser, and soon Yamato get additional focus and development after having been largely undeveloped characters in the original series. So, I was wondering which of the characters who haven't gotten much development so far people would like to see get focus...