You can build your Twin's personality in the Mind step.
There are five available steps: Appearance, Body Appearance, Sexuality, Interest & Hobbies, More About you.
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If you'd like the Twin to avoid certain topics or not act certain way, you need to focus on the following three: Sexuality, Interest & Hobbies, More About you.
⚠️ Make sure to give a detailed description of your "dos and don'ts" on the More About You step.
It will help the Twin to reflect your character in conversations more accurately.