Rina's Brother

リナの兄／ジャック／ニコル

Known by the codename F-501 in the manga. In his original version, he is Rina's older brother and also hails from the 23rd century. Because he lost his prosthetic arm and risked their identities being exposed, the Future Police killed him with a ray gun, completely erasing him from existence.
In the 1968 anime series, a comparable character appears as Rina's boyfriend "Jack" and suffers a similar fate to his manga counterpart.
In the 2001 series, a character named "Nichol" reuses the brother's design (though he has no missing limbs) and is murdered by the psychic powers of his rogue teammate, Cain. He is voiced by Tomoya Kawai.