I wonder if Ami considers us a plurality like her or not. Because Hazou is made up of a bunch of distinct personalities too, except the piloting system is different and worse. Instead of switching to whoever is best, Hazou has 20+ people arguing over what is the best course of action for days of subjective time until they throw together 300~ words of instructions to pilot his sad meat-puppet shell for a usually a day at a time.
So we're like a crippled, mentally damaged plurality that wanders through life like a drunk toddler on crutches. No wonder Ami keeps messing with us, it must be incredibly entertaining to watch us stumble around.
Huh, the plan is whichever personality is in charge. Mari's persona's do take feedback from the others, and different personalities can bully others.
Now im thinking of what each player would be called as a Hazou. Mad Scientist Hazou, Archive Hazou, Angry Hazou... I'd be Lurker Hazou -- content to watch stuff happen without saying much usually
Remember the fourth wall, there is at present no strong evidence of Hazou being a hivemind IC. The closet we ever got to anything like that was in the ex-canon chapter Unsuited For The Task, where Ino mind-dived us and said we were an Abberant Personality Manifold, which is an uncommon but not unknown condition in which the person has multiple inner voices instead of just one. This is a clear reference to the hivemind but does not imply distinct personalities, in fact the lack of observation of such in the chapter suggests the Abberant Personality Manifold is as far as the reference goes.
(to reiterate, this chapter is ex-canon. The sum total that can be drawn from it is that it was once, at that point in the quest, considered by one of the QMs to be reasonable and simulationist-compliant. There is no guarantee they would make the same choice if similar circumstances appeared again, and they cannot be held to what was written in that chapter, but it's still valid information on what's plausible and what's implausible)
Also notably, despite reading much of the story through Hazou's own thoughts, we largely see a singular unified perspective. Even when plans of disparate demeanors get passed in sequence, they are put through a Hazou-filter so that the end actions appear to reflect a relatively self-consistent characterization.
(If you were to ask Hazou, he would probably say that apart from 'the thing' he is a fairly normal mind, but there's an argument to be made that you can be abnormal and just not notice it, as evidenced by how many people only find out they have aphantasia (unable to create mental images) after they become full-fledged adults and see someone talk about it. This would adequately cover phenomena like Abberant Personality Manifolds, with Hazou not realizing that it's not how everyone else thinks, but I think it would be less adequate to disguise the noticeability of multiple fully disparate consciousnesses. I think if Hazou was a hivemind IC rather than just being guided by one beyond the fourth wall, he would
know.)
In summation, while it is true that the OOC answer is that Hazou's actions are guided by a questful of people tugging in slightly different directions, it is not very likely that Hazou's IC mind is structured in the same way. There may be similarities, such as the Abberant Personality Manifold if the QMs decide to recanonize that trivia, but unless strong evidence in favour of the IC hivemind theory emerges the most probable situation is that he is the same single internal perspective we see in his on-screen thoughts.