While most usually shown in a full set of samurai armor that covers his entire body, his true appearance underneath depicts a pale skin man with pointy elf-like ears and long, black hair. He wears a formal, black suit.
Like his former master, he seems to take the form of different ages depending on how much he has revived. In Shinobu Mail, he takes the form of a small child when he first meets Koyomi Araragi outside his samurai armor.
Seishirou was originally a Japanese warrior known for his ability to kill oddities by using the swords Kokorowatari and Yumewatari. During his travels, he met Kiss-shot Acerola-orion Heart-under-blade, who assumed the role of the local god in a village in Japan, and began visiting her on occasion, although Seishirou did not show any aggression towards the vampire. Kiss-shot's presence soon took the attention of the entity later identified as Kurayami, and despite their combined efforts to stave off the effects of the Kurayami in the village, the entity continued its rampage, consuming the inhabitants of the village and Seishirou in the process.
Kiss-shot managed to escape with Seishirou's disembodied hand, which all that remained of the warrior, and used this to revive him as a vampire, turning him into the first minion of the King of Oddities. This fate was gravely rejected by Seishirou, and he leapt into the sunlight soon after his revival, cursing Kiss-shot as well as saying her name for the first time as he turned to ash. Among the things that he left behind after his suicide was a replica of the Kokorowatari made from his own flesh, which remained in Kiss-shot's possession.
He was reincarnated fifteen years prior to the beginning of the series, four-hundred years after his first suicide attempt.
Only briefly mentioned, it's revealed that Kiss-shot's first minion attempted suicide by jumping into the sun.
Seishirou desires to meet Shinobu Oshino and possibly continue his relationship with her, but he is defeated by Araragi in a duel and afterwards rejected, commits suicide, and is eaten by Shinobu.
- The name Seishirou can literally mean "son of life and death", while the surname Shishirui can be interpreted as "involved with corpses".
- He shares the voice actor of Araragi, Hiroshi Kamiya. In one scene, it seems to imply that Seishirou literally stole his voice in order to speak, but his true voice is still voiced by Kamiya when it returns to him.
Characters of the Monogatari Series
|Araragi Family||Koyomi Araragi • Karen Araragi • Tsukihi Araragi • Araragi Matriarch|
|Heroines||Hitagi Senjougahara • Mayoi Hachikuji • Suruga Kanbaru • Nadeko Sengoku • Tsubasa Hanekawa/Black Hanekawa • Shinobu Oshino • Sodachi Oikura • Ougi Oshino|
|Oddity Specialists||Meme Oshino • Deishuu Kaiki • Yozuru Kagenui • Yotsugi Ononoki • Izuko Gaen • Tadatsuru Teori • Seishirou Shishirui|
|Hearsay Police Department||Zenka Suo • Nozomi Kizashima • Mitome Saizaki • Tsuzura Kouga|
|Vampire Hunters||Dramaturgy • Episode • Guillotine Cutter|
|Other Characters||Hitagi's Father • Hitagi's Mother • Tsunade • Mayoi's Father • Tooe Kanbaru • Suruga's Father • Suruga's Grandmother • Nadeko's Parents • Tsubasa's Parents • Mizudori • Rousokuzawa • Higasa • Rouka Numachi • Sasayabu • Komichi Tetsujou • Deathtopia Virtuoso Suicide-Master • Tropicalesque Home-A-Wave Dog-Strings|
Oddities of the Monogatari Series
|Types||Vampire • Sawarineko • Heavy Stone Crab • Lost Cow • Rainy Devil • Jagirinawa • Flame-Wreathe Bee • Shide no Tori • Tsukumogami • Slug Tofu|
|Oddity Inflicted Characters||Koyomi Araragi • Tsubasa Hanekawa • Hitagi Senjougahara • Suruga Kanbaru • Nadeko Sengoku • Karen Araragi|
|Oddity Characters||Shinobu Oshino • Mayoi Hachikuji • Black Hanekawa • Dramaturgy • Episode • Yotsugi Ononoki • Tsukihi Araragi • Kako • Kuchinawa • Rouka Numachi • Seishirou Shishirui • Zenka Suo • Nozomi Kizashima • Mitome Saizaki • Deathtopia Virtuoso Suicide-Master • Tropicalesque Home-A-Wave Dog-Strings|