And we're saying that about a series where the iconic design is bondage angel, and the entire bestiary is about taking artistic liberties on mythological figures?
Bondage angel still meets the fundamental criteria for the conventional angel look: a humanoid figure with two wings. The bestiary being about taking artistic liberties is a complete lie, those artistic liberties are pretty much only taken to an extreme degree when there is very little visual information about the deities being represented.
When information about a demon's look existed Kaneko seemed to consider it in most of his designs:
Agares:
Astaroth:
SMT4 version of Astaroth for shits & giggles:
Orobas:
Stolas
Paimon:
Bael:
And the final blow:
Asmodeus, a comparison between the demon that has a drawing in the same source Kaneko got the basic designs above from - let's see what SMT4 artists came up with:
You can't seriously tell me that Kaneko and the new artists' design philosophies are the same.
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And given that we have, for example, 13th century depictions of Seraphim, is it really that important to insist on 'conventional look"?
Kaneko designed Seraph based on that though:
he just didn't call it Gabriel/Uriel/whatever like the other artists seem willing to do.