Uh.. Hi there.
Just writing down what would be cool, just in case.

Starting with a classic wish of mine, which so far I have only seen done this way in one game.
Different fonts for special occasionsCase in point: Vampire the Masquerade: Bloodlines.
They did a lot with different and color-coded fonts to highlight special dialog choices that were outside the usual path, like intimidation or seduction. I found it to be a very nice touch to have fonts convey a mood like that.
Examples for the skills Intimidation, Seduction and Persuation:
1.
You will do as I say.2.
Pretty please, with sugar on top ...3.
Help me help you.4. Would you do this for me?
These were skill based dialog choices, i.e. if your skill was too low you wouldn't even see the choice, and you could still fail. There were also sure-fire talents (read: spells) like
Dementation or Domination, which would, when used during a conversation against you, turn all dialog options to a certain font/color/text.
(Dominate)
1.
Yes, master.2.
Yes, master.3.
Yes, master.I've only seen this once in Bloodlines, but it felt very natural. The game also featured different fonts associated with the various clans, but I guess that's irrelevant to Div:OS...
Anyway, there are many ways to play with typography in dialogues that might enhance the overall experience and make conversations more natural or simply more fun, which in view of Original Sin's theme -- co-op dialogues, finally! -- could be quite endearing, don't you think?