As an actor of several decades, I have been challenged with developing vastly different characters across multiple genres. 

I eventually developed my own technique which proved invaluable.

I am a strong advocate of reactive performance, which essentially means you remain flexible enough to respond to whatever your co-stars may give you. It means being confident in your performance to vary your performance and even improvise when needed.

This technique I now bring to writing. Character driven stories. Flawed, hopeful, struggling, and overcoming.