Looking at the first page I thought that Kouen's Djinns sure are big, but in the next one Agares was only half as big as his other Djinns.
Interesting that two of Kouen's household look similar to the Djinn of their household, except the Phenex one.
Hakuei's Djinn equip looks very similar to the one shown in the anime, Otaka probably had a hand in her design.
Koumei's equip is like Sindbad's. where the eight pointed star are on his hands. From 176 we know that to stop a Djinn equip by force, the star needs to be cut, in their cases, would they lose their hands when the equip disappears or are they protected?
Same with Sindbad's Zepar equip, wonder what would happen to his tongue?