[Armin doesn't want to humanize the Trumps. They do that enough themselves, taking on human form and appearance. Psyche is obviously not their true name, and by keeping to their arcana, there's a constant reminder of what they are. But with Chizuru, maybe...]

I'm... not sure about that. Last jaunt, it might have been more because she was one of the ones working against ROSE. I know ROSE was taking precautions against the other Trumps interfering with her rescuing SAGE.