Jigoro Kuwajima (桑くわ島じま 慈じ悟ご郎ろう Kuwajima Jigorō?) is the man who trained Zenitsu Agatsuma and Kaigaku. He was formerly the Thunder Hashira (鳴なり柱ばしら Nari Bashira?) in the Demon Slayer Corps.
Jigoro was a very short, elderly man with visible forehead wrinkles and large, slanted eyes, as well as a straight scar with even six prongs running along his right cheekbone. He had notably bushy eyebrows and a large moustache, as well as slick white hair that he wore smoothed down to puff out around the base of his head, with what would've been a fringe also swept back away from his face. Jigoro was also missing his right leg, with a wooden peg taking its place, this feature made more prominent in the anime than the manga.
Jigoro wore a jinbei styled kimono like the one worn by Sakonji Urokodaki, only with a yellow-brown base color and a pale triangle pattern in the stead of the blue and water-patterned theme Sakonji sports. He also carried a thick wooden cane with him to support his body due to age and his missing leg.
Zenitsu Agatsuma (我あが妻つま 善ぜん逸いつ Agatsuma Zen'itsu?) is one of the main protagonists of Demon Slayer: Kimetsu no Yaiba and a traveling companion of Tanjiro Kamado. He is also a Demon Slayer in the Demon Slayer Corps.
Zenitsu is a young man with fair skin and downward-sloped, scared-looking eyes that fade from soft brown to gold. He has short, yellow hair of varying lengths, cutting off squarely at the ends where it fades to a darker orange color, that falls in front of his face in uneven bangs. Before he became a Demon Slayer, Zenitsu's hair was originally black, but it turned the color it is currently when he was struck by lightning during his training.
For some time following the battle at Natagumo Mountain, his limbs temporarily shrunk due to Demonic poison but were able to return to normal afterward thanks to the medicine given to him by Shinobu Kocho.
He wears a paler brown version of the standard Demon Slayer uniform, which consists of a dark brown gakuran jacket, a white belt around his waist and hakama pants that extend, as well as his signature white-triangle patterned, yellow and orange gradient haori. As well as this, Zenitsu also sports a pair of tabi socks, tied at the front in 3 white bows, with the same pattern as his haori, and white-laced footwear.