How does AoC resist power null? It came from the fact AoC copying magucal girls, which includes their powers, memories and resistances.
How potent is AoC’s memory absorption or mind reading? AoC memory manipulation can steals and mimic Homura's own Memoru manip, which is 2-A on potency.
How AoC able to make millions of copies of another character but I’ve only seen it being able to make a few copies of Sayaka, Mami, and Kyoko? Because it's as impossible as showing Madoka resetting the Multiverse one by one. AoC sole purpose is to destroy the entire Multiverse, creating millions of copies throughout the Planet should be easy to it.
It’s stated on AoC’s page that it can power drain non-corporeal abstract concepts, what’re the reasons? AoC main powersource is from UKG's curse, which is type 2 Nonexistent Physiology in nature. Non-corporeal and Abstract shouldn't be a problem due AoC power can interacts with NEP type 2..
The AoC lacks a soul? Mainly from the fact Wraiths itself are like the literal side effect of Madoka's Law, so they just manifested in Madoka's new multiverse as the being tailor made to feed on emotional energy that could damaging the new Multiverse. That, and most of them are made of literal miasma. Alternatively, they AoC copied witches ability, which includes their immunity to soul manip due to lacks of soul.