Should every character be "goth"-ified (Patreon)

Right now, the only characters that have been goth/punk/dark-ified are the main cast I'm working with: Lincoln, Leni, Luna, Rita, and Lola. Now that I've brought in Lily, should I change her personality to fit in with the game more. For example, Lily is currently a perky part-timer, aka an older version of what she could become. Should I change her to be a moody, depressed art girl? That's mostly a hypothetical but as I add the main cast of the show, should they all be changed?

Here's another example for Lisa's story.

Current Lisa Plan: Lisa is Lincoln's disinterested boss. She notices that Lincoln has changed due to his Incubus powers however she isn't very effective. As Lincoln's power grows she becomes interested in the physical changes he's exhibiting. Lincoln cooperates with some of her hands on tests.

Darker Version Idea: Lisa, a long time ago, caught Lincoln trying to help Leni cheat. As such, she is blackmailing Lincoln to be her research assistant, making him do her course work while she does her own research. Lincoln allows him to regain control of the situation.

The game overall will remain a dark-comedy, this is only looking at individual personalities and redesigns like the one above. Please feel free to leave your thoughts as well.