1) They should still stay pretty close to the power cap, though you can be a bit more flexible than usual.
2) Definitely not that big. Keep it to a size where it couldn't inflict much more damage than the game power cap.
3) They should avoid collateral damage where possible but the Regent won't be pissy as long as they aren't careless about it. If Childe acts super destructive he will probably get in trouble, but not if damage just happens alongside necessary attacks. So basically, he should be trying to avoid it where possible, but he doesn't need to hamstring himself over it.
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2) Definitely not that big. Keep it to a size where it couldn't inflict much more damage than the game power cap.
3) They should avoid collateral damage where possible but the Regent won't be pissy as long as they aren't careless about it. If Childe acts super destructive he will probably get in trouble, but not if damage just happens alongside necessary attacks. So basically, he should be trying to avoid it where possible, but he doesn't need to hamstring himself over it.