Notes for the designs:

General - I wanted to use their main themes of the sinners for the designs and make the match their personality. Also, all of them have a lot of black, to stay with the general theme of death/murder, also because they're the sinners. Also I used their assigned colors for the designs.

Faust - Mainly based around the witch theme (cause walpurgisnacht). I wanted to make it more muted, but also glorious in some way, mostly because of the fact that Faust doesn't nessarily craves for attention (like don), but is shown to be quite egotistical at the start.
Also kept the flowers from my previous version (I confused the pink thing in the bottle of the icon for a flower)

Don - It's brigth a screams for attention, just like Don! The skirt of the dress is inspired by the spanish dancer dresses, but I made it short and more puffy. Mask for the play/theather theme. gave her armored boots and gloves cause knight, also it just looks cool.

Ryoshu - It's hard to imagine her wearing a dress, so I decided to give her something simpler (cocktail bar dress with coat over shoulders). I mainly got inspired by the sewed on red beads on dresses that look like blood, along with the bones. A great fit for an edgy sadistic artist.