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HoloEN playing Eu4,ck3/2,hoi4 or Victoria 2
The yabe potential in all of those is just to big, specially kiara choosing Austria in hoi4 or gura forming a crusader state in CK, backseating would be a massive problem as well since I don't think any of them will know how to play "properly".
Stellaris maybe ok as long as they refrain from genocide, but I don't think anyone will care about xenos being holocausted, imperator Rome if mumei wanted to play some ancient history might be okay as long as she doesn't cosplay as Hadrian.