I would love to see monica go down a full fallen path, with some competition between her and the other whores; ie become the "queen" of the whores. Getting tattoos (pref. lower back), piercing or even a boob job, just to beat her competition. Not sure whats in store but this is what I'd love to see.
It would be great to see it in some (or one) of the routes. The most obvious one is the fallen path. Let's say that Monica "forgets" to pay her pimp (that hag) her fee or commission (or whatever it's called in that line of business) and as a punishment the hag tattos Monica, for example, some tramp stamp (actually it can be quite fun with all that logic, "Monica, don't worry, I'll remove this tattoo when I get my money and my old life back".
or make her do some piercing and forces her to wear it all the time, for instance, septum piercing like this
Although I'm not sure about a boob job. Monica already has huge tits. Any bigger than that would look ridiculous, in my opinion, or at least will detract from the character's attractiveness.
But there is a problem with all this. At least for now, all the routes are going at the same time. No matter whether Monica is living with Fred, or the maid, or is renting the flat in the slums, the player can play all the events, even though they don't make any sense at the same time. I mean why would she sell her ass on the streets if she lives comfortably with Fred or has a decent job at the bar? And this is fine and convenient because a player doesn't need to have many saves to play all the events in the update, even though some people already complain about this lack of logic.
And here comes the problem with body changes. Decent Monkey would need to render the same events with Monica looking differently, which greatly increases the amount of work. Or, of course, it is possible that Monica could look differently in different events, I mean in fallen path events she will have a tattoo and on other routes she won't, but it would look even more strange.
Or Decent Monkey can finally split the game into different independent routes. Maybe he'll do it in the forth episode. It does make some sense, especially since it seems that Ep.3 is coming to its conclusion soon and, after all, it IS called "Crossroads".