Regarding CRAUs, if you wanted to take the CR from both games, we'd allow it.
Characters will generally be reverted to their default canon state for the case of CRAUs, we can't really easily control for the powers that people acquire in other RPs where the power scaling and intent are completely different so it's just not something we're prepared to deal with.
AU can be as much or as little as you want! We do generally expect however that the character will remain recognizable, so we highly recommend fitting the AU powerset and personality around the character's base form, even if there are understandable changes sparking from the differences in the AU backstory.
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Characters will generally be reverted to their default canon state for the case of CRAUs, we can't really easily control for the powers that people acquire in other RPs where the power scaling and intent are completely different so it's just not something we're prepared to deal with.
AU can be as much or as little as you want! We do generally expect however that the character will remain recognizable, so we highly recommend fitting the AU powerset and personality around the character's base form, even if there are understandable changes sparking from the differences in the AU backstory.