Dark Lord IF

[Subaru-kun]

Without the aid from Reinhard, he's the broken Subaru who didn't give a damn to people other than Emilia. (This route branches off when Subaru crying for help in the 4rd loop of the 1st Arc failed)

Although his Authority of Return by Death present, he cannot use Authority of other Witch Gene.

Although he is still Subaru at his core, since this time there is no one giving advice to him, he basically will redo his past until he reaches a satisfying conclusion, has no qualms using underhanded tactics not done in the main story, and being more proactive in abusing RbD when his feeling towards Emilia grows the more he dies.

The once and only time of Re:Zero where he died happily.

[Elsa-san]

The Ayamatsu route heroine (partner position main story-wise). The more Subaru-kun fallen in the dark side, the more likely she wanted to be on his side. From their first meeting in the first arc, due to Elsa missing the sense of belonging to the organization she's in, she later became Subaru's ally.

In this route, she took a liking to Subaru and in the end she, along with Meili, felt the sense of intimacy towards Subaru. Her last scene fighting Reinhard to buy time and the scene of her bidding farewell to Subaru is the author's way of writing her love scene. What Nier and Kaine scene is this! (reference from Nier the game).

[Meili-sempai]

Similar to Elsa, she became Subaru's ally since her sister is his ally. Her impression towards him is not bad and felt intimacy towards Subaru. In the end she died shielding Subaru. By the sinful strike of Reinhard.

Although Subaru, as a member of the owned his own house, he often used Elsa and Meili's safe house to keep in touch with them, both the sisters and Subaru do share some kind of pseudo-family relationship. How Meili views her relationship with Subaru is best shown when she died protecting Subaru. Meili Sempai's really an angel.

[Guiltylowe-san]

What sin does Guiltylowe-san commits to deserve this......

[Man in black suit]

Though his name is not mentioned in the story, he is actually Otto Suwen, slave edition. He didn't meet Subaru in Arc 3, and thus had no way to paid his debt, and ended up caught by the man of influence of the capital, Russel Fellow. Otto ended up being treated as Russel's right hand for his divine blessing.

In this route, Otto acted as the agent to clean up Subaru's mess when he's active as a Witch cultist. Whether Otto is aware of him sinking into the pit-less abyss in the name of Witch Cult is unknown, with his dream broken and his status as a free man gone, he didn't give a damn of what is going to happen to him anymore. To make things worse, whatever happened to him would cause great issues to his family, making him unable to escape this mess.

Although whether or not he survived in the end is unknown, he is most probably fell victim to one of Subaru's scheme.

[Blue]

He is the prime example of people who became broken when the mist erase their person of dependence who is too big in their heart. And Felix is the worst among the cases. Main story-wise, Felix is being the same situation with Rem if Rem, before being saved by Subaru in Arc 2, has her memory of Ram erased.

In the end, although Subaru did defeat Gluttony in this route, what would happened to his lost memory of Crusch will not be illustrated in this IF story since it is not resolved in the main story.

It's just, regardless of what happened afterwards, Felix seemed to remain by Subaru's side until his demise.

[Roswaal]

He's in the ambiguous position, neither friend or foe, regardless what arc he's been.
In this route, he received offer from a Sin Archbishop(Subaru) to make Emilia the King, confirming that Subaru is the person described in the Book of Wisdom, and obeyed Subaru's order. Despite noticing his scheme running out of track, Roswaal acknowledged the way current Subaru was, and have no problem of this route going into total chaos, so he cooperated with Subaru full of anticipation.

Although he was sacrificed for Subaru's scheme in the end, due to the fact that Subaru himself is not enough to set the country ablaze, Roswaal won't die until he got his job done. Alas, Ram, now with lifeless eyes, obeyed his orders.

[Micro Spirit]

The very Micro Spirit Subaru formed contract with just to kill Petelgeuse. She's just a tool for Subaru, and is not given a name.

The arson of Regulus mansion, as well as the great fire that burnt the capital are all her great achievement, showing her growth. Since Subaru has achieved his goal, and was seemed to absolve his contract with her upon the great fire of the capital, there is high chance of her being slayed by Reinhard to protect Subaru.

[Regulus-san]

Since he was drown in the main story, this time his was butchered by the other way of dying I brainstormed for the main story.
Despite being treated like dirt, after watching Regulus-san unchanging attitude in every route, it reminds me of the importance of not changing. Sorry, I lied.

FYI, in this route it is unknown whether he killed Subaru or not. Maybe the kill count is zero.

[Petelgeuse]

He is the only person, in this route, who managed to invoke friendship in Subaru. Just that for Petelgeuse, Subaru's friendship is too prideful so it's a no.

It is most likely Petelgeuse is the Sin Archbishop Subaru put the most effort to get rid of.

[The royal candidates]

Every other candidate except Emilia is the same with the main story. Although Felt was caught for the theft, Reinhard met her when he went to investigate the frozen store room (tl note: Rom's pawn shop, most probably), the confirm Felt qualification for the candidacy, and thus Reinhard becoming her knight.

After Julius died of poisoning, it is unknown whether Anastasia given up her candidacy. Also, Priscilla and her followers gone missing in this route.

Emilia was anxious after all the great feats outside of her knowledge were given to her. Since in this route she never made to the Sanctuary, she didn't gain allies like Garfield and Frederica and didn't overcome her past, she remained naive and childish until the end. Her mentality was still remained the mentality of her Arc 3 self.

[Reinhard Van Astrea]

The Sword Saint/Master Swordsman who was 'killed' by Subaru's scheme of hero-slaying.
The strongest entity who knows no defeat despite Subaru challenged over a thousand times and still see no glimpse of victory. Thus, instead of aiming for Reinhard's life, Subaru decided to 'kill' Reinhard by tarnishing his reputation and name. The great fire that burned the capital and the country is all for the sake of Emilia ascension to throne, as well as 'killing' Reinhard.

In this route, the White Whale's mist erased both Wilhelm and Crusch, resulting some minor changes of relationship among the Astrea family members. His feud with his father was toned down and the father-son relationship improved compared to the ones in the main story. Thus, Reinhard's humanity who is always been the doubt from the readers are more apparent than the ones in the main story. Although his relationship with Felt has a rough start, it turned out OK in the end. He,along with Elsa, is happier than his main story counterpart. (His grandfather is vanished though)

When Subaru started the Great Fire in the capital, Felt, Old Man Rom, and Heinkel were most probably dead. In order to tarnish Reinhard's reputation of incapable of defending the country as well as the well being of his master, there is no doubt that Subaru would go that far. And thus, "Pride" Subaru has achieve the feat of Hero-slaying.

However, in contrary of Subaru's intention of tarnishing his name with Hero-slaying, Reinhard was furious not because of this tarnished reputation, but the fact that his precious people getting slaughtered. His final confrontation with Subaru is fruitless as no way they would form mutual understanding, and nothing is solved.

[Difference compared to the Main Story]

Rem died in Arc 2, with Arlam village half destroyed (Petra and her friends were dead as well).

Crusch and Wilhelm died and got their existence erased in the White Whale subjugation in Arc 3.

The events of Santuary in Arc 4 is not triggered. As Roswaal didn't manipulate the weather to create snow, Garfield's still hole up in the Santuary. Echidna was tired waiting.

The battle of Priestella in Arc 5 is not triggered, due to the fact that Subaru's efforts of killing off other Sin Archbishop and thus branches off the a new Subaru route.

Arc 6 onwards is all together a different route.

Thanks for reading:)