You’ll need to create a second character in the portal, one that is the main MC and one that is the duplicate with pig tails.
If you’re including CC, you can have the duplicate match the MC with code similar to the below:
First, CC the MC. Then, match the duplicate character to MC:
#Your CC goes here
@MC2 becomes MC
Lastly, make the changes you’d like to to the duplicate character (change hair, etc)
@MC2 changes hair into Full Pigtail
And then you can direct them as normal in scenes.
INT. BEDROOM
@MC2 is idle_bounce_happy_loop
NARR (MC)
Believe it or not, that’s me.
INT. LOCKERS
@MC is flirt_wink_happy
NARR (MC)
I couldn’t care less.