User blog comment:HollowIchigo58/High School DxD Season 4 Announced/@comment-2143738-20161029234109/@comment-1359322-20161030054155

Shemhazai, Lord Phenex, Lord Gremory (S1) well i think those are some that i remember. Well season 1 & 2 didn't really have it so obvious like season 3 though. None of the Hero faction members were shown at all. Even Sairaorg's Queen Kuisha was skipped.