It's been established that they want you to be more involved in using the canonical characters currently available to the player to interact with rather than implementing individuals of original conception or characters not yet defined, including future students.
You said you got a Brock script, but you made a number of factors up. It's true that Brock didn't receive much of an introduction as a character so far in the visual novel, except if you make a visit to the Academy Swimming Pool during free period - Brock is introduced as a supposed peeper spying on Misty.
Anyhow, a good resource at this point to look into are Pokemon Visual's social media and gaming websites such as Facebook and Twitch, and checking what little entries exist on the game's wiki since their is material there from v1.0.2 that may help with your writing. I think Brock had a summary page for himself so I would recommend looking into that.https://pbs.twimg.com/media/Cq7ZOW8XYAAb0Lg.jpg:large
Anyway, good luck on your scripts. Hope the image helps.