To explain a few things:
I do use a lot of shorthand for hair as the style translation from traditional to ms paint can become a chore for shaggy hair, Jina's hair being the most frustrating to get down. Overtime the curled flip hair has just become a thing for me to do thats faster. (I used to have a lot more fun with that with my traditional comic ;o; but it was very time consuming.)
And yeah, some characters do have similar hair styles. Demona's bangs style although matches Koji's a bit with the front wedge, is actually her imitating another character's hair (that is picture in the lineup but his hair's actual style is different than depicted here.)
I do notice yeah that Quail and Beatrice look similar in color scheme, but Quail's hair is red, while Beatrice's is brown. At quick glance Beatrice's is still a lot more reddish in color than Demona's brown. (Beatrice's color palette was actually also taken from another character's and inverted for more thematic reasons.)
I wish I had all the refs for everyone's dream world designs because that's mostly the biggest catch for a lot of them. I'm not gonna make you review those though if you don't want to.
Thank you for the feedback, it was really insightful and I'm gonna keep this in mind!!!