User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-73.57.25.92-20180111180147

Some things that could have been part of volume 24; -a picture with kuroka’s and koneko’s parents in it(shuri himejima got one why can’t they) -just like tobio ikuse got his appearance shown to us in the form of concept art(in this case both regular image and concept art image) vasco strada(his old form, his young form and both his swords), crom crauch(human form and dragon form), Lint sellzen(along with her angel form and balance breaker form), Bova tannin, Roygun Belphegor, Ouryuu Nakiri(or vol 23), Gogmagog(who really should’ve been shown in vol 9 but hopefully will be seen in season 4), Sha Wujing, Zhu Bajie, Kanzaki Mitsuya, Tiamat(or vol 20 or vol 23), the rest of slashdog’s team, Baalberith, Verrine, Sonneillon, Gressil, and thanatos could’ve had the appearance shown to use through concept art.

Some things that could be added to dxd in general -Kuroka’s and koneko’s father could have been an alchemist like the alchemists seen in the manga/anime, the ancient magus’ bride(http://mahou-tsukai-no-yome.wikia.com/wiki/Magic, http://mahou-tsukai-no-yome.wikia.com/wiki/Alchemy), especially since alchemist are essentially magical scientists, which would explain why devils would employ him to search for a way to artificially make super devils(most likely through alchemy, which involves changing one thing into something new)

-Concepts from the manga/anime tsugumomo could’ve have been added as well. Such as taboo children to explain how people like tsubaki(who could summon or create monsters), and tobio(who could enter balance breaker at birth) were so powerful at an young age(http://tsugumomo.wikia.com/wiki/Taboo_Child), and shadows(more specially shadow selves, http://tsugumomo.wikia.com/wiki/Shadow) which tsubaki could’ve summon from her mirror alice to fight her enemies.(http://tsugumomo.wikia.com/wiki/Category:Terminology)

-terminology for Exorcists from blue exorcist(http://aonoexorcist.wikia.com/wiki/Exorcists), and Japanese style exorcists/malison cleansers from tsugumomo(http://tsugumomo.wikia.com/wiki/Exorcist)

-and instead Zatouji having a team it should have been kiyome abe and her beasts. Kiyome could’ve been an descendant of the famous Onmyouji(Japanese type of magician, part of it includes being able to tame magic beasts) abe no seimei(her family name is abe like him), along with being a beast tamer she could’ve been a Onmyouji and an exorcist like from the tsugumomo series, arm with a tsugumomo(http://tsugumomo.wikia.com/wiki/Tsugumomo)most like a sword, and her team of beasts could been like the monsters seen in the manga/anime series monster musume: Daily life with monster girls(http://dailylifewithamonstergirl.wikia.com/wiki/Monster_Musume_Online_Species_List, http://dailylifewithamonstergirl.wikia.com/wiki/Other_Races)