So, in brief, I need a way to have two types of dialogue systems.
There's one style that takes place on the overworld, that has been solved already.
Now, the second one is much in the style of Metal Gear Solid.

Basically two talking sprites. With an active animation while text is on screen (Typewriter effect).
I'm afraid to make a fool of myself so,
1) What is the method to have two dialogue managers in a scene and have them play nice. Should I be doing it in some different way?
2) Any tutorial or something recommended to get this result?