I got two siblings who are yokai hunting police detectives from Tokyo, Japan~
Haruka and Mugen Kurogane sketch done by darlingGrim!
Based on these~
Peep the dark grey streak in their bangs, it's a cute little detail not captured in the sketch~
Haruka's kinda the calm, overprotective older sister, while Mugen's the overthinking, yet reckless younger brother. The two have a great relationship outside of work, but while working together, they're constantly against each other. They can be silly at times, but yeah! I'm not sure how either one would act around your characters, but give 'em a go if you want!