This makes a lot of sense, Moriah must of lost his crew and adopted Perona for some sort of companionship. It's also said that Dr. Hogback was recruited to Moriah's crew a lot later (as Perona was there with Moriah when they went to recruit Dr. Hogback), so her and Moriah have the deepest bond.
Moria is actually not a bad guy. Sure what he did to Thriller Bark people was wrong. Looking at his past, he lost his crews to Kaido so he collected corpses and turned them into zombies so he wouldn't lose his crews again since zombie can't die.
He also designed Kuma C to resemble plushie who Perona had strong attachment to to make Perona happy. Moria also came to Pirate Island alone, Yonko Blackbeard territory to get Absalom back to his crew. This makes me appreciate Moria more.
When do you guys think Perona got her devil fruit? I was thinking that it could go both ways, either Moriah adopted Perona after seeing that she has a devil fruit or that Moriah gave her the devil fruit later on.
I personally would prefer if it was the latter option
I agree with Light. The doll might be a hint that Perona has her df after Moria adopted her.
I'm also interested how did Perona discover her power. Would be funny if she accidentally used her df power on Moria lol.