This is a list of characters for the manga and anime series Parasyte and live-action Korean series Parasyte: The Grey.
Main characters Shinichi Izumi (泉 新一, Izumi Shin'ichi)
Voiced by: Nobunaga Shimazaki (Japanese); Adam Gibbs (English) He is a high school teenage boy whose hand is infected with a Parasite and is repeatedly put into difficult positions. Shinichi must find a way to peacefully coexist with Migi, the Parasite which has taken over his hand, and reconcile his desire to protect humanity from the Parasites with his desire to keep his own Parasite a secret in order to avoid being killed or used as a laboratory specimen. Like a superhero with a secret identity, he must also find a way to explain away his Parasite-fighting activities, as well as the stress and grief they cause him, to his friends and family. While originally forced to have Migi fight for him, Shinichi later gains heightened abilities when Migi's cells spread through his body, and fights his own battles, with the two having an advantage in both being able to act independently and work as a team. Shinichi's retention of his humanity, despite gradually becoming emotionally distant as a side-effect of Migi's cells, makes most of the other Parasites deem him a threat. After defeating Goto, with Migi deciding to "go to sleep" indefinitely afterward, Shinichi returns to Satomi and attempts to live a normal life again while having an understanding of natural order from his experience. Sometime later, Shinichi goes to South Korea and offers to help Jun-Kyung and Team Grey get rid of the parasites. Masanori Harada, a 20-year-old student, wrote to the editor of Monthly Afternoon magazine noting that Shinichi acts calm when he is threatened and that he is "not human anymore!" Iwaaki responded, stating that Shinichi is accustomed to "close calls" partly because Migi calms Shinichi down during battle. The statement and response were printed in the April 1993 issue of Monthly Afternoon. Shinichi is played by Shota Sometani in the film while Masaki Suda portrays Shinichi in the Korean series Parasyte: The Grey. Migi (ミギー, Migī; also called "Righty") Voiced by: Aya Hirano (voice), Rinka (sound effect) (Japanese); Brittney Karbowski (English) Migi is the Parasite which lives in Shinichi's right hand, named after the Japanese word for "right" (右, migi). Unlike "successful" Parasites, Migi has no desire to kill humans for sustenance, and is nourished by the food Shinichi eats, however he suffers from fatigue and regularly falls asleep for four hours at a time, leaving Shinichi vulnerable. Migi is, like other Parasites, completely without emotion. His primary consideration is survival (and learning about the world), and he has threatened (and in some cases attempted) to kill other humans who pose a threat to his and Shinichi's secrecy. When he and Shinichi were first coming to terms, he even threatened to remove Shinichi's other limbs in order to render him unable to place the two of them in danger. Migi can be reasoned with, however, and has just as much reason to be mistrustful of other Parasites as does Shinichi. On the other hand, unlike Shinichi, Migi has no inclination to place himself at risk in order to protect other humans from Parasites. But Migi gradually evolves over the course of the series, he becomes more human while able to temporarily separate from Shinichi's body. After the final battle with Goto, having been absorbed by the Parasite prior to his defeat, Migi's composition is greatly altered to the point that enters a deep sleep, but not before expressing that he was glad to have met Shinichi and not having taken over his body when they first met. Migi briefly woke up to save Satomi from falling to her death without Shinichi's realization. Iwaaki explained that while Migi appears to be Shinichi's weapon, in fact Migi is in control of the battle and orders around Shinichi. Iwaaki explained that Migi is easily able to order Shinichi since Shinichi is young and "needs guidance", while Migi would find difficulty if he became a part of a politician or a president of a company since in that scenario Migi and his host would argue a lot. An 18-year-old from Saitama Prefecture named "Midari" asked in the letters to the editor that if Migi took Shinichi's left hand, if he would have been named "Hidari". Iwaaki answered that it would be Hidari, but Iwaaki felt that the name would be similar to those of Bokuzen Hidari or Tenpei Hidari and the name would "bring to mind a doddering old man, so that wouldn't have been a good idea". Iwaaki then said that the first man to climb Mount Everest "had a name an awful lot like that..." Migi is voiced by Sadao Abe in the film.
Jeong Su-in / Heidi (정수인)
Portrayed by: Jeon So-nee a parasite victim with a traumatic past and when it fails to take over her brain, she enters a bizarre coexistence with it, unlike other parasites.
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