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Yeah, it's kinda meant to be a tongue-in-cheek tribute to tokusatsu shows, where the enemy always conveniently invades the one location where the heroes live. Although there is a justification that I'm planning on revealing later.
They're on the shortlist!
The gun (more specifically the cards) target people who have an interest in the MC, mostly as they are familiar with a fictionalized version of them from their own universe. It's not brainwashing - they're simply taking people from the infinite multiverse who already feel that way and are willing to help fight.