I have a simple but game-changing suggestion
If you want to play a girl character you should be required to provide evidence that you are a girl in real life. Something like a birth certificate or timestamped selfie with username as verification should be enough.
Why is this important? Because some people could be misled by girl characters assuming that the real-life player is also a girl, and consequently become emotionally invested in this person only to have them turn out to be some ugly man, this I'm sure has caused many people to quit playing. So this would increase the player base because we could advertise ourselves as the first runescape private server that has confirmed female players.
Please let me know what you think! And if this passes, I volunteer to be the head of the girl confirmation moderator team.
Cheers!