Halloween was a fun time to be young, to be able to go out at night dressed up in costumes and be reward for it with candies. Surely this was one of the golden moments of the time. Well besides Christmas, but this was not the time for it.
Issa definitely was enjoying herself. It was a chance for her to dress up like a magical girl and indulging in some of her fantasies while obtaining treats.
Not that she would describe it like that. No, she was actually on patrol right now. After all Halloween was also a time trouble both mundane and supernatural often occur. She had to be ready to intervene in case any trouble or danger would ruin this holiday for everyone.