Rokuro had the appearance of an older man with a stocky build and pale skin that was decorated with black, vein-like patterns down his face, arms and legs. He had long, dark purple hair that he left down, and a short jagged beard around his jawline, as well as golden, cat-like eyes with the kanji for "Two" etched into his left.
He wore what appeared to be a dark cyan version of a typical karate gi.
As with the other Lower Ranks, Rokuro both respected and feared Muzan Kibutsuji as his leader. After almost every Lower Ranks had been killed by Muzan, Rokuro was visibly scared that the same would happen to him, and resorted to begging his leader for more blood to increase his strength so he wouldn’t die, showing quite a cowardly demeanor. Despite this, however, Rokuro appeared to be very confident in the potential of his abilities as a Demon, since he claimed that if he received just a little more of Muzan's blood he could definitely become a strong fighter worthy of being in the ranks of the Twelve Kizuki, which showed he had a great resolve and passion for his role.
After all of the remaining Lower Ranks gather together at the Infinity Castle, Muzan appears before them in his female form. He regards them with annoyance and tells them to lower their heads and squat in front of him. After they all do so, Mukago utters that she's sorry to have been ordered to bow, as she didn’t recognise Muzan in his current form. Muzan angrily asks why she's speaking without permission, telling her to silence herself and not to talk unless directly asked a question. As she cowers in fear at her feet, Muzan goes on to explain the death of Rui, the only Lower Rank who wasn't among the ones gathered before him, and asks the remaining Demons why they're so weak.
Muzan lectures them about how being in the ranks of the Twelve Kizuki isn’t the end; it is only the beginning of what is to come. He states their sole purpose is to consume blood so they can be of use to him. Muzan angrily retorts that it has been hundreds of years since the Upper Ranks were last replaced, yet the Lower Ranks are replaced all the time, to which Kamanue thinks to himself that he can’t just tell them that. Capable of reading the minds of those he has shared blood with, Muzan angrily asks Kamanue why they couldn’t be told that, expanding and extending his arm into a tentacle to grab the Lower Rank by his neck and lift him into the air. A terrified Kamanue attempts to apologize, but is promptly eaten by Muzan as Rokuro and the rest of the Lower Ranks keep their heads lowered in a shocked silence.
Next, Wakuraba thinks to himself that he's also going to be killed, so he needs to do more in order to keep his position as a Lower Rank, and, simultaneously, Mukago thinks about how she runs every time from the very mention of a Hashira. Muzan repeats aloud both of their thoughts, and a terrified Mukago exclaims that what she thought isn’t true and that she would fight with her life on the line for him. Muzan asks her if she is denying what he was saying, and, as Mukago begins to apologize and cry, another bout of Muzan's tentacles crushes her into the ground, killing her.
Shocked by this, Wakuraba immediately assumes the worst and decides it would be a wiser choice to flee than stay if he wanted to keep his life. He dashes out of the Infinity Castle at a high speed, and Enmu thinks to himself that that was a stupid move to make since Muzan will kill him either way. This conclusion turns out to be correct, as Wakuraba's head is swiftly chopped off, so fast that it leaves him wondering how he even died in his final few moments.
As one of the two Lower Ranks left alive, Rokuro panics, exclaiming that he can definitely still be useful to Muzan if he just defers his death for a little longer. Muzan asks how he would be useful, how long the deferment would last, and how much power he could wield as he was, and Rokuro explains that if he had more of Muzan's blood, he can adapt it and definitely become a strong fighter worthy of his leader. Muzan angrily tosses Wakuraba's head down next to Enmu and Rokuro, asking Lower Rank 2 why he should be given more blood and saying that he should know where he stands. Rokuro tries to protest, but Muzan silences him and says that, since he had attempted to instruct his leader, Rokuro deserved to die.
Abilities and Powers
Little is known about Rokuro's strength and abilities as a Demon, but, as he was chosen to be one of the Lower Ranks of the Twelve Kizuki, it can be assumed that he possessed stronger powers than to average Demons and was superior to Kamanue, Rui, Mukago and Wakuraba as he was given a position above them. However it can also be assumed that he was not as strong as Enmu, the Lower Kizuki 1, and the only one of the Lower Ranks who ranked higher than him.
- His name was revealed in the first fanbook.
- His name, which contains the kanji for "six", could be a reference to his ultimate fate, being the sixth demon of the Lower Ranks to die on screen. (The first being Kyogai, then Rui, then Upper Ranks 3, 4, and 6.)
- ↑ Kimetsu no Yaiba Manga: Chapter 51 (Page 14).
- ↑ Kimetsu no Yaiba Manga: Chapter 51 (Pages 10-18).
- ↑ Kimetsu no Yaiba Manga: Chapter 51 (Pages 18-19).
- ↑ Kimetsu no Yaiba Manga: Chapter 52 (Pages 4-5).
- ↑ Kimetsu no Yaiba Manga: Chapter 52 (Pages 6-8).
- ↑ Kimetsu no Yaiba Manga: Chapter 52 (Pages 8-11).
- ↑ Kimetsu no Yaiba Manga: Chapter 52 (Pages 11-13).