Just because she has the same appearance does not mean Midori is an expy of the P3 Fem!Protagonist, because I haven't read any of the supplementary material where they give her a personality and thus cannot replicate it. At least not intentionally.
You pretty much already did (outgoing, kind and loyal girl) because there ISN'T any supplementary material they give her personality in except for the stage plays. They more or less shaft her for the Male MC.
You sure? I'm pretty sure there's like a one-off manga with her in it.
And if not, then the only real way I could do that would be to let other characters monologue and then have her respond with a single sentence that happens to be exactly what they need to hear.
There's a stage play and a one-off audio drama, that's it.
also praise quiet protagonists
how could i expect anything else from someone who described their persona as "john does the windy thing"
who the fuck is john