Akaza was physically 18 years old when he died and became a demon, but chronologically, he was over 130 years old, having lived from the Sengoku period (mid-16th century) to the Taisho era (early 20th century). So, in human years, he'd be around 18 at his transformation, but his actual lifespan spanned over a century.
Akaza's original human appearance as Hakuji at the age of 11. Akaza's full appearance as a demon.
Nezuko Kamado
Since Nezuko Kamado's birthday is December 28, she was 12 years old when Muzan Kibutsuji turned her into a demon in the first chapter of Demon Slayer.
As the highest-ranking member of the Twelve Kizuki, Kokushibo is an extraordinarily powerful demon, second only to the Demon King Muzan Kibutsuji himself. He has battled countless Demon Slayers and has amassed vast experience and knowledge over his nearly 500-year-long life.
Despite losing his memories, Akaza was noted to have subconsciously retained his strong feelings for Koyuki, this is seen where Doma noted that Akaza absolutely refused to kill and eat women during his hundreds of years as a Demon, despite his obsessive desire for more strength and power.
Courtney Nieman he also won't kill women. Doma confirms this after his death. At most, Akaza would simply knock them out if he absolutely HAD to fight them.
While many Hashira died in the fight, some survived: Giyu Tomioka, the Water Hashira, and Sanemi Shinazugawa, the Wind Hashira, both survive the final fight, carrying on the memory of their fallen comrades. Tanjiro also survives, and after the war, the Demon Slayer Corps disbands because demons are gone for good.
The only canonically LGBTQ+ character in Demon Slayer is Suma, one of Tengen Uzui's wives, who is confirmed to be bisexual and polyamorous in the series' databooks, showing affection for both men and women, including Tengen and her fellow wives, Makio and Hinatsuru. While other characters like Mitsuri are speculated to be queer, Suma is the sole officially confirmed character, with her relationship dynamic highlighting both bisexuality and polyamory within the Demon Slayer Corps.
It is stated that Yoriichi only survived because he was born with the mark, which Kokushibo was not. Due to that single fact, yes, Kokushibo would have died at 25 years old without a single doubt. In his mind, he was perfectly in the right to become a demon, as he killed two birds with one stone.
There's no single "worst" character, as it's subjective, but top contenders for hated or disliked characters often include the sadistic demon Doma (Upper Rank Two) for his cruelty and killing of Shinobu's sister, Muzan Kibutsuji for being the source of all evil, and sometimes Kaigaku, a traitorous Demon Slayer, with some viewers finding Zenitsu annoying due to his constant screaming, though many defend him.
The author of Demon Slayer, Koyoharu Gotouge, is a woman, though she maintains privacy and uses a gender-neutral alligator avatar; while she hasn't publicly confirmed her gender herself, it was revealed by a Weekly Shonen Jump employee, and she prefers they/them pronouns, as she's uncomfortable with female pronouns, a common practice for female authors in shonen manga.
In the first few episodes of season 1, Giyu Tomioka is 19. Then when we meet him again in episode 15 of season 1, he is 21.
Inosuke Hashibira
He typically wears the head of his deceased boar mother as a mask. Despite his brutish exterior, he is a highly capable combatant. He eventually becomes a close ally to Tanjiro and his companions. Following the disbandment of the Demon Slayer Corps, he marries Aoi Kanzaki.
Trivia. Physically, Dōma is 20 years old and Akaza is 18. However, chronologically, they are both over 100 years old.
Kaigaku, Zenitsu's former Thunder Breathing classmate, is the weakest of the Upper Moons. Despite his impressive speed and combat versatility, he lacks experience with his Blood Demon Art. He is placed as the current Upper Moon 6 after the defeat of Gyutaro and Daki.
Following a fierce fight with Tanjiro and Water Hashira Giyu Tomioka, he recovered his human memories. Stricken with guilt for his demonic deeds, Akaza chose suicide, seeking to join his loved ones in the afterlife.
Although the manga does not directly depict the moment of his passing, according to official settings and the rules of the Mark, Tomioka Giyu ended his life at the age of 25 due to the price of the Mark. His death was not accompanied by battle and pain, but rather a peaceful departure after witnessing an era of peace.
As the secondary holder of Upper Rank Six, Daki was an extremely powerful demon, having killed and devoured seven Hashira in the past.
Ranking of the 28 strongest characters in Demon Slayer 1/ Tanjiro the new Demon King 🌄 2/ Yoriichi the Sun Hashira 🌅 3/ Muzan the Demon King 💀 4/ Kokushibo the First Upper Moon 🌙 5/ Doma the Second Upper Moon ⛄ 6/ Giyomi the Rock Hashira ✴ 7/ Akaza the Third Upper Moon ❄ 8/ Sanemi the Wind Hashira 💨 9/ Giyu the Water ...
He coldly insulted Mitsuri by telling her that only a bear, boar or cow would marry her, before leaving while telling her to forget they ever met. While this was maybe somewhat understandable, his harsh insults were completely unnecessarily.
Megumi Fushiguro from Jujutsu Kaisen is widely interpreted by fans as being pansexual, due to his stated preference for a partner with a strong moral compass rather than a specific gender or physical trait, suggesting attraction to people regardless of gender, though the manga doesn't explicitly label him. While some interpret his romantic feelings for Yuji as pansexuality in action, he hasn't had explicit romantic storylines yet, but his broad criteria point towards being non-gender-specific in his attractions.
LGBTQIA+ travelers are unlikely to encounter violence, outright hostility or overt discrimination in Japan. However, conservative values about LGBTQIA+ sexuality and non-binary gender expression are common, particularly outside large cities.
In some cases, an exceptionally talented Demon Slayer can become the designated successor to one of the Hashira, known as a Tsuguko. To become a Tsuguko, a Demon Slayer can either apply for the position and get accepted, or get scouted by one of the current Hashira.
Giyu Tomioka is the stoic swordsman that fights using his "Water Breathing", and the Water Hashira that led Tanjiro towards joining the Demon Slayer Corps. The man in the tengu mask. He's a cultivator of prospective Demon Slayers, who lives at the foot of Mount Sagiri, and the one that trained Tanjiro.
By the end of the manga, only one Hashira survives and lives a full life: Tengen Uzui, the Sound Hashira. The rest meet tragic ends, either in battle or due to the toll of their Demon Slayer Marks.