GM and other Improv notes

Voice!: accents help to develop voice, but, to develop a character voice is critical. It is not critical to always be used, or it is not a failure to not use the voice when speaking in character. However, it is a point score that done consistently creates an edge.
Exercising a voice is like playing a accent, but in speaking at length in accent and not worrying if the accent is good or accurate, yet keeping some good handle on the voice, is the destination.
This requires exercise, and I suggest Emotional Cafe, but with an accent.

Movement!: walking a certain way is a critical expression for the character. Granted, one is to be standing in a booth, and gesturing, yet, the exercise of developing a walk is a better foundation for creating a variety of gestures in the upper torso when not walking.
The exercise is Cat Walk, wherein, one person walks one way, then changes that walk (turns around walks back). The next person imitates as accurately as they can the second walk, then, turns around, and invents another walk.

Do a Scene!: picking a number between 1 and 8, and then being given the level of technology, create a scene or picture with words. Only descriptive language.

Adventure!: One player is picked, they are given a computer or paper with a dungeon map, a key (numbers with correspond) and monsters.
Three other Improvisers do whatever it is they want to do in this given map (could be just addressed online). Monster encounters, if violent, are merely opposing die rolls. Players are eventually killed.