Does rep matters in Tob ? In SoA, I had to keep it low because if not Viconia and Korgan would leave. Now my rep is 20, they just growl but stay... Also, may a high rep ruin my romance with Viconia ?
My partie is Myself (fighter chaotic good), Aerie, Nalia, Imoen, Korgan and Viconia.
I think that they took out people leaving your party because of reputation, you could always test it by getting medieval on some peasants and seeing if everyone else leaves
Well, if the evil members are still with your party, then that answers the first part of your question. As to the second part, no, rep/alignment don't have any effect on romance.