There would be male and female characters in the school whom act differently from Jessica.
The main cast of charcters (other than Jess) should look a small presentage normal but also looking like monsters but Jessica "hangs out" with them because they are the most "normal" looking, to Jessica.
(if you want to get replies from me quickly then you should just DM me on discord, my username being the same as it is here, BigBadOOF)