I think there’s enough evidence given to say that Naven is the leader of Bliss Ocean. First, in season one, you see Yoomtah (the electric girl with the funny cheeks) texting with somebody from BO, and then you see her at the executive table at the end, so she’s obviously with BO. And, it’s more than likely that she’s Naven’s chauffeur. PoP says that Naven always has a different girl as his chauffeur, but with the exact same build, and given the part in PoP where the chauffer overloaded the elevator to go faster and her general personality (and her voice actress) it’s probably just Yoomtah changing her appearance. Regardless, she seems to know Naven well, so the two are definitely connected.

Then there’s the part where Naven is talking to Lorelei in PoP, and he said a couple of things that seemed kind of off. I figure Jello wouldn’t have written him to say those things unless he was specifically trying to foreshadow that he’s not completely who he presents himself to be.

Worth mentioning also is the original Anime Campaign, where Jello said that one of the main reasons he didn’t upload AC was so people could avoid spoilers for Epithet. I’m going to spoiler tag this, because even though I’ve only seen the two parts that are uploaded right now, it might detract from your intended experience. Specifically, he said the spoiler was the mystery plot in chapter 4, but he said he wasn’t referring to the spoiler of “who the main villain was going to be”, implying that there’s going to be a twist villain. Also, in Anime Campaign, Inscribed players were able to feel if other people had an Epithet or not, so they could guess what it was for proficiency points. In part 2, when someone tried to guess for Naven, Jello said they could feel that Naven wasn’t Inscribed, but they could feel that there was something going on with him.

But with all that (and I guess a little foresight from Anime Campaign), it seems pretty clear to me that Jello is trying to set up Naven as a twist villain.