I'll go over them all
Emerald usually dresses casually, with a little bit of a punky bite.
She really likes accessorizing with jackets, even when it is warm out.
Lolly it is not goth, but she does have a weird aversion to bright colors, as she typically wears muted and dark colored clothing. She also abhors wearing pants and shorts, so she typically only wears skirts and/or dresses.
The flower in her hair is a personal thing, and also a bit of a spoiler if you haven't read Reap yet.
Isham is a vampire, but she also overheats easily, so unless she is going to be out in direct sunlight, she prefers short sleeved shirts and shorts. the opposite of Lolly, she hardly ever wears skirts or dresses, and much prefers wearing pants and shorts. She also tries to wear sandals more often than not, because they are comfy and easy to wear.
Esen-Ali is an interesting case, as she is the princess of heaven, so she where is very elegant clothing, however she is also VERY old, so her elegant clothing is also rather simple in design. the hilt of her sword is a pineapple, as that is the symbol of Heaven (what with the apple being the symbol of Hell and all)
Which ironically, you do not see any Apple motives with Kno, the princess of Hell. She actually does dress more goth like, however she does actually like bright colors. Due to being hatched without a voice box, she always wears a scarf to soothe her neck (and to act as a second set of arms). She also always wears a form of an Alice band, but that's more likely to do with autism.
Finally, we have the major active antagonist Edgar. He used to be a bio scientist, hence the lab coat, however, you can see that he ain't right in the head, hence the explosives. The Guest mask actually isn't there to protect him from the fumes or anything like that, but to hide his identity, and this gas mask was the only one that could fit his face. I would explain why, but that would be a huge spoiler.
Also, not a fashion thing, but I also shade him with a different brush than the others to show how volatile he is.
