Mansaku Nijimura

"Nothing kills him — Not crushing his head, not cutting his body into tiny pieces, not even carving parts of him away... He always regenerates, doomed to go on living like this forever."

- Keicho Nijimura

, also known as Father Nijimura (虹村父), is a minor character featured in the fourth part of the JoJo's Bizarre Adventure series, "Diamond is Unbreakable".

He was an abusive father and entered DIO's service but the Vampire's death causes the seed in his brain to turn him into a near mindless monster with regenerative powers. He is kept prisoner in the attic of the Nijimura Brothers' new home and Keicho Nijimura seeks Stand Users so that he can be killed for good.

Appearance
Nijimura Sr. is a rotund creature with blistered green skin, mismatched eyes, no ears, a squished nose, and puffy lips resembling a beak. He has a mohawk-like hairstyle with small bald patches in between. He wears a sleeveless shirt along with shorts.

Before his deformation, as seen in a photograph, he was a man of masculine features and short, dark hair, wearing a genial expression.

Personality
Nijimura Sr. is unable to communicate above a basic, animalistic level. Keicho assumed that he is unable to recognize his two sons and possess much, if any, self and environmental awareness.

His sons were originally frustrated by his apparently-meaningless habit of searching through a chest in his room. He would take everything out of the box and proceed to cry, doing the routine over and over for ten years. However, Josuke restores the torn objects on the ground to reveal that Nijimura had been searching for a photograph of himself and his young family.

Before his mutation, Nijimura was shown to be a man who loved his family. However, he was by no means a good father. He agreed to work for DIO in order to keep his family's economic situation together, but at the same time, he would often beat his sons without a second thought when he was stressed.

Stand
It is implied that Nijimura had a Stand, having been recruited by DIO during his Stand search. Whether his current survival is maintained in part by a formerly more pronounced Stand ability or if it is simply the result of merging with vampiric cells inside of him is still up to speculation. Nijimura seems effectively immortal and possesses extraordinary healing capabilities; his limb is shown regrowing back in an instant when removed.

However, despite his apparently indestructible status, Josuke notices that his body is also abnormally flimsy, having Crazy Diamond effortlessly punch Nijimura's right arm off when he is grabbing onto Koichi's leg during their first meeting completely unintentionally. This is also an observation shared by Nijimura's eldest son, Keicho, as he once called his father "a pile of rotten flesh".

It is suggested that Nijimura might not be able to return back to who he was before the mutation, as his cells have long since merged with DIO's spore planted inside of him.

Background
Twelve years prior to Diamond is Unbreakable, the mother of the Nijimura family died, leaving the father in depression. On top of that, Japan had been going through a tough time economically and the family soon fell into poverty causing the father to constantly abuse his sons as a result.

Two years later, the father started to receive letters with money and jewels. Much later in his life, his older son Keicho would realize his father had sold his soul and heart to DIO, who, at that time, was scouring the globe for a Stand user capable of recreating reality.

DIO, however, distrusted the father and implanted a seed of his undead body within him. When Jotaro defeated DIO, the seed burst, causing the father to slowly mutate into a monstrous form, and later lose his ability to speak. This form would automatically heal any wounds inflicted, effectively making him immortal. Keicho subsequently searched for a means to end his father's miserable life. Josuke Higashikata can not heal Nijimura with his stand, Crazy Diamond

Diamond is Unbreakable
The father of the Nijimura brothers is first introduced as a bestial, unintelligent creature. It is kept on a chain and searches feverishly through a box for his family's photograph. However, Keicho misinterprets the action as mere insanity and angrily beats his mutated father for that reason. Only when Josuke examines the contents of the box and pieces the photograph back together is the father finally pacified.

Later in the series, Okuyasu is seen attending his father when they meet with Josuke to discuss Yoshikage Kira's actions and to look after one another in case any of them may be assaulted. At the end of the series, Nijimura Sr. is seen adopting Stray Cat and bonding with his new pet.

Trivia

 * In the credits of the live-action film, he is named . This follows the name theming of his family, as all three men have kanji in their names used for the -based system of which groups digits in larger numbers in sets of 4: man (万) in Mansaku represents 104 (10,000 or 1 0000), oku (億) in Okuyasu represents 108 (100,000,000 or 1 0000 0000), and chō (兆) in Keicho represents 1012 (1,000,000,000,000 or 1 0000 0000 0000).

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