Emulating the player characters instead of the GM

Emulating the player characters instead of the GM
Again I realized that I'm more interested in being the GM than the players and using solo roleplaying to scratch that itch.
Edit: real GMing isn't possible for me at the moment, not even via hangouts.

I wonder if you have some ideas on how to go about that?

My method is that I give the PCs something like a "default mode/behavior" and some basic personality. You can steal Mouse Guard's Instincts, too. In D&D type games a marching order also helps. (Ruins of the Undercity uses this technique.)
For example:
- Grunt, Warrior, 1st in marching order, cautious and likes to check out everything, tries to solve problems with violence
- Sylvain, Thief, 2nd in marching order, likes to rush ahead, impatient, tries to solve problems by being clever or trying to talk his way out
or something like that.
Then I use my judgement or the Mythic GME oracle to determine the characters' behaviors.
I do not emulate fictional players.
EDIT: this has been done before, see these APs:
https://forum.rpg.net/showthread.php?537852-Mythic-0D-amp-D-B1-9-In-search-of-Adventure

More suggestions?