Aye.
People randomly leaving - esspecially easy - is another factor why I prefer a bit of independence. At least at the start. If there are people who have kept posting for a long time since day-one then there's little fear I have in them disappearing given they've shown dedication. But having everyone forced to interact straight out the gate has a chance that when someone disappears the entire RP will go to shit. I've been in a few like that, in one particular case the entire plot of the beginning part hinged on one guy posting and he never delivered.
At least from my perspective: the prospect of everyone being independent of each other leads to the chance that if someone does drop out unexplained then the show can move on.
I suppose if you need ideas then you could look at how Chapa as a slave-hunter and add it to your character being a former slave. In that case someone could have an out-standing warrant on your character for her return. So you could get with him to perhaps plan out something involving him. And until the point you and him can begin some loosely jointed story you could write through some general introductory things. Sort of a exaggerated 12:00 on the
heroes' formula hypothesis. Do some thing to familiarize us with things not otherwise in the app or implied. Or add some short scenarios she could react to for character building. And then Chapa gets involved and kicks yours and his stories into the body of the story.