pro cannibalism individual

1) Why did Utsugi cut off Hajime's lower body and eat it

He did not Literally Eat Hatsutori's lower half. The melting started because of Seodore. (Record 5)

And then Utsugi shows up and fights off Seodore and then Takes Half of Hajime's Body. (I'm not screenshotting every line because I'll hit the image limit, so please rewatch the full scene for more context).

And you can see this scene again in Record 7, in Utsugi's version.

Hatsutori is dying. Utsugi wants more than anything to stop it. So he does!

2) For what reason did he hate Minoru Harada?

He didn't hate Minoru. the screenshots here are from records 6 and 7. I can't get everything obviously but I think rewatching might help! There are a lot of good scenes between them.

he gets told very very clearly that everything will end in ruin if Minoru stays. He likes minoru! he does! but that's a part of the problem.

He does everything he can to get Minoru to leave, and to stay away. He can't tell him why. He can't explain it. Because to explain is to burden Minoru with the curse of knowledge that Utsugi has no idea how to cope with. And he does, even still, try to reach out for help. He tries to ask Minoru for help and Minoru FUMBLED. But they don't hate each other.

They fight, and they argue and disagree, but they don't hate each other.

I can't screenshot every line like this but he makes it pretty clear, i think.

I haven't included the entire record 7 ending monologue here but it's really good!!

3) Did Hajime's condition worsen because he was a fragment or was it related to his mental state?

His powers react to his mental state. Is this what you were thinking about? His physical condition of missing half his body is because of the fight in 1999.

4) This had something to do with the cell inhibitor, but why did Haruki tell Reiji not to use his power towards the end of route S?

This was ambiguous. my general interpretation was that if they used their powers, theyd be more closely connected to Hatsutori, so when the belfry rang, they'd die too. (these screenshots are from S, not S+).

First, I should probably explain why I think Seodore is the Lime Azure:

We know the Lime Azure went missing alongside Theodore in the sinking of the Polaris. (record 4)

The rock is gone, but Seodore returns.

He also makes mention of his pieces being used during the chainsaw incident - we know that both Rangiri and Mutei have used pieces of That Damn Rock in Rangiri's Medicine and Mutei's Factor Artifacts respectively, and both of those were done BEFORE the chainsaw incident happened. We know this because a) Rangiri is Unstable after the chainsaw incident, and b) Mutei is just Gone.

the quotes below establish that Aescula's Medicine had the Lime Azure in it (record 7)

These lines establish the artifacts as having pieces of the Lime Azure in them (record 7) (DLC credits) (Artbook) (interlude report 5), and establishes them as created by Mutei ("Dr. Martin")

 [Mutei has] left his descendants a rainbow fountain pen, an emerald lens, and a ruby knife.

The pieces were from Seodore.

We can also establish this from the fact that the artbook highlights the Lime Azure as the catalyst for Seodore's "Respawn" ability. The colored sections were originally censored. (TL HERE)

Respawn (Real Name: Continue) Type: Persistent Ability Source: Tag/Player Character Catalyst: Lime Azure Level: Impossible to measure Seodore might not have Empyrean cells himself, but he has regenerative abilities and durability very close to that of Empyrean lifeforms. However, even that has limits, and there are injuries that result in death for him. This ability activates automatically when Seodore either 1) dies or 2) gets into a situation he can’t escape from. When this ability activates, it restores him to his most recent safe point. The restored Seodore is the same person, with the same memories and awareness of all the events that have transpired. Sometimes this ability activates and rewinds time to before the incident that killed him occurred, and sometimes it simply makes the body vanish and revives him but doesn’t change the situation itself. His earrings are also recognized as part of him, so they disappear with his corpse and appear back on him when he respawns, just like the rest of what he’s wearing. 

(for more about what I think "player character" means, I talk about it here. That's off topic for now, though)

Seodore mentions a handful of different times that he doesn't age, he doesn't change physically, it just is stuck at as he was at 25. (from the artbook).

[N’s Attached Note: Could it be: [Seodore's] hair doesn’t grow either?]

It's not just that Seodore lost his memories; it's that the original person who HAD those memories is dead, and Seodore is a new consciousness, in that same body.

From the Databook Timeline (TL HERE). The colored sections were originally censored.

9/29/1886: Born: Theodore Riddle 4/15/1912: Incident: Polaris cruise ship sinks. Theodore Riddle is shipwrecked. 5/25/1912: Seodore Riddle returns. Born: Seodore Died: Theodore

From the DLC credits, we get this line. SOMETHING happened on the Polaris (the details of which are unclear).

I know in the interlude reports and a few other places, they describe it as memory loss, but Seodore makes the distinction very clear and actively rejects seeing himself as "Theodore Riddle". For all intents and purposes, Theodore Riddle is dead. Seodore is the one who's here.

I think the chainsaw incident changed things for seodore too, but as that's more speculative, i'll leave that out of this response ^^; The only thing I'll note here is that in the databook timeline, the chainsaw incident is described as "Seodore's Awakening." I personally think this refers to Seodore's awareness of the nature of the world/the edges of the "screen". This is heavily speculation, though. A lot of theorycrafting is putting together several ambiguous lines that come together to imply something; we can't say much for sure because we simply don't know.