Kouhei Nikaidou is the Private First Class of the 7th Division and Youhei's older twin brother.

Like his brother, he has a well accented face with a thin, pointed nose. His eyes have the rounded shape of black color equal to his hair cut very short. He is seen wearing the uniform of his ward.

~!After the death of his twin brother Youhei, Nikaidou became focused on revenge against Sugimoto. 
He seems to have a strong craving for morphine as just the mere mention of it was able to get his full attention.!~

~!Kouhei loses a multitude of his body parts throughout the story. He lost:
His left ear to a bear when hunting for Tanigaki,
his right ear when Tsurumi cut it off after catching him following said hunt,
his right leg to Hijikata's ambush inside Edogai's house as well as
his right hand when he tried to shoot Sugimoto after his failed ambush in Abashiri Prison.

He gets prosthetic limbs for his leg and hand made by Narizou Arisaka. The prosthetic limb has a hidden gun in it. 
!~

In the early twentieth century, Russo-Japanese War veteran Saichi “Immortal” Sugimoto scratches out a meager existence during the postwar gold rush in the wilderness of Hokkaido. When he stumbles across a map to a fortune in hidden Ainu gold, he sets off on a treacherous quest to find it. But Sugimoto is not the only interested party, and everyone who knows about the gold will kill to possess it! Faced with the harsh conditions of the northern wilderness, ruthless criminals and rogue Japanese soldiers, Sugimoto will need all his skills and luck—and the help of an Ainu girl named Asirpa—to survive.
 
(Source: Viz Media)
 
Note: Won the 9th Manga Taisho Award in 2016 and the 22nd Tezuka Osamu Cultural Prize in 2018. Nominated for the 20th and 21st Tezuka Osamu Cultural Prize and the 40th Kodansha Manga Awards in 2016.

In the early twentieth century, Russo-Japanese War veteran Saichi “Immortal” Sugimoto scratches out a meager existence during the postwar gold rush in the wilderness of Hokkaido. When he stumbles across a map to a fortune in hidden Ainu gold, he sets off on a treacherous quest to find it. But Sugimoto is not the only interested party, and everyone who knows about the gold will kill to possess it! Faced with the harsh conditions of the northern wilderness, ruthless criminals and rogue Japanese soldiers, Sugimoto will need all his skills and luck—and the help of an Ainu girl named Asirpa—to survive. 

(Source: Viz Media)

__Height:__ 178 cm (5'10'')

[Twitter](https://twitter.com/sugitaLOV) | [Youtube](https://www.youtube.com/channel/UCbPVSXP89cDlsiMf0jet1zQ)

**Non-Anime Roles:**
- Professor Zema - Tevi (VG)
- Cirsium Zorba - Metaphor: ReFantazio (VG)
- Mr. Shining Knife - No.1 Sentai Gozyuger (TV series)

[Twitter](https://twitter.com/StephenOfOlde)

Separated from Sugimoto, Asirpa now travels toward the Russian border, focused on discovering more about her and her father’s involvement with the coded tattoos. But Sugimoto is determined to find and protect Asirpa! Along the way, he’ll discover new people, new cultures rich with history, and an unforgiving terrain. Will Sugimoto and Asirpa survive their journeys and reunite? 
 
(Source: Funimation)

The high-stakes search for gold continues in the harsh wilderness of Hokkaido! More and more people seek the treasure map, and the race to find its living pieces is brutal as all get-out. War veteran Sugimoto and his guide to the wilds, Asirpa, are hot on the trail, and as long as they stick together through thick and thin—chitatap and miso—they’ve got a shot at finding that gold.

The fourth season of Golden Kamuy.
 
The race to obtain the lost Ainu gold is nearing its peak, as even more formidable ex-prisoners are set on keeping their tattooed skins intact. Saichi "The Immortal" Sugimoto and Asirpa can finally move forward together, but Asirpa's time with Kiroranke and Ogata Hyakunosuke has slightly altered her ambition and strengthened her determination. As their party leaves the Russian territory, they gain a peculiar follower.
 
Meanwhile, Toshizou Hijikata's crew makes major moves to get invaluable skins, falling into the poisonous trap of a dangerous convict. Although each group possesses a strong advantage over the others, even First Lieutenant Tokushirou Tsurumi—the most powerful and ruthless contender—cannot advance without Asirpa's help. However, his ominous plans for when they will inevitably meet remain a mystery.
 
(Source: MAL Rewrite)
 
Note: On November 7, 2022, it was announced that the seventh episode of the season and beyond would be postponed due to the passing of a main staff member. The season restarted broadcasting from the first episode on April 3, 2023, with the seventh episode released on May 15.