They would be curious before the AUs begin to set in, wanting to see some of these powers in play! As someone who's being brought in by the AU begins to use their powers, they would just be assumed as being a part of the setting, the special ones.
It's fine for anyone to have families off screen (and, in fact, we encourage it! as this can be hard to manage once children are in play). You can decide he's at the dorms for a special reason like having that power, or you can have him wander off to live with his sudden imaginary family (once more, as his background requires). It's up to you!
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They would be curious before the AUs begin to set in, wanting to see some of these powers in play! As someone who's being brought in by the AU begins to use their powers, they would just be assumed as being a part of the setting, the special ones.
It's fine for anyone to have families off screen (and, in fact, we encourage it! as this can be hard to manage once children are in play). You can decide he's at the dorms for a special reason like having that power, or you can have him wander off to live with his sudden imaginary family (once more, as his background requires). It's up to you!