Nezuko Kamado Zenitsu also protects Nezuko multiple times when she is in danger, evident during Zenitsu's first meeting with Inosuke Hashibira and the battle against Enmu in the train. Eventually Zenitsu and Nezuko would marry and start a family as evidenced by their descendants.
Nezuko marries Zenitsu Agatsuma in the Demon Slayer series.
Therefore, it is safe to assume that Zenitsu and Nezuko end up together and have kids in the future. This is proof that Zenitsu loved Nezuko and she too came to love him at some point in time.
In the second chapter of the second Demon Slayer light novel, One-Winged Butterfly, during the pillars training, Zenitsu tells his fellow demon slayers that he has a girl he loves, Nezuko, who is waiting for him at Butterfly Estate.
It is confirmed in the Volume 23 extras that Inosuke and Aoi did eventually end up together and that they have two great-grandsons, one of which is Aoba.
Zenitsu's debt is estimated to be around 600,000 yen in modern currency. This massive amount of debt likely came from his 7 ex-girlfriends. Despite all of them being beautiful, they treated Zenitsu like a slave, tricked him as well as robbing him of his money.
Eventually Zenitsu and Nezuko would marry and start a family as evidenced by their descendants.
It's implied that the characters from the original series have all since died and have been reincarnated in modern day Tokyo in the final chapter of the series, but two key characters confirm that Nezuko Kamado and Zenitsu Agatsuma eventually did have a family together as their great grandchildren, Yoshiteru and Toko ...
After the battle, Tanjiro returns home with his sister and friends. Later it is revealed that he married fellow slayer Kanao Tsuyuri.
Kanao is seen holding her hands close to her chest and slightly blushing, and falls flat on her face when Kiyo unexpectedly calls out to her from behind. It is implied in an extra chapter following the end of the Functional Recovery Training Arc that she may have had a crush on Tanjiro.
She is a demon and the younger sister of Tanjiro Kamado and one of the two remaining members of the Kamado family.
Shinobu to Giyuu on Kimetsu no Yaiba Official Light Novel. GiyuShino is the het ship between Shinobu Kocho and Giyuu Tomioka from the Demon Slayer fandom.
Yae ( 八 や 重 え , Yae?) is a young woman who joins Giyu Tomioka on his travels in Giyu Tomioka's Story after her father Matazo transforms into a demon.
Sanemi and Giyuu are married and live in hollowed out tree near a bunch of glowy mushrooms. Sanemi works at a construction site while Giyuu is a humble fisher. They're friends with a butterfly named Shinobu and will sometimes invite her over for a cup of tea.
Jigoro Kuwajima ( 桑 くわ 島 じま 慈 じ 悟 ご 郎 ろう , Kuwajima Jigorō?) is the biological father of Kaigaku Kuwajima, adoptive father of Zenitsu Agatsuma, and a former Upper Moon.
During Hashira Training, Zenitsu receives word that Kaigaku had become a demon, and that Jigoro committed seppuku as atonement.
RenGiyuu is the slash ship between Giyuu Tomioka and Kyojuro Rengoku from the Demon Slayer fandom.
During Tanjiro and the rest of the Hashiras' showdown with the Demon King Muzan, Tanjiro is mortally wounded and dies. At the same time, Muzan receives a particularly fatal lil' booboo himself. As Muzan is about to shuffle off the mortal coil, he uses the last of his powers to turn Tanjiro into a demon.
Naturally, any demon's survival instincts would dictate them to consume human flesh. However, Nezuko has been fighting her instincts and hasn't consumed human flesh.
After his treachery, Kaigaku later becomes Zenitsu's archenemy. His cowardice would later lead him to his downfall when Zenitsu overcomes his insecurities as Kaigaku mocks Jigoro. Kaigaku's Thunder Breathing training would lead to his Blood Demon Arts being related to lightning.
Ami Agatsuma is the Sister of Zenitsu Agatsuma that we all know from his cowardly nature.
Yoshiteru Agatsuma ( 我 あが 妻 つま 善 よし 照 てる , Agatsuma Yoshiteru?) is the great-grandson of Zenitsu Agatsuma and Nezuko Kamado and the younger brother of Toko Agatsuma, who is a teenage student.
Zenitsu is very aware of his own cowardly tendencies. He recognizes that he always cries and snivels in the face of danger instead of tackling it head-on. Zenitsu's crybaby tendencies have certainly given fans of the show several instances of comic relief.