Jinzouningen 17-gou

Artificial Human #17, Android 17 in the English adaptations, is a fictional character who first appears in the Dragon Ball manga created by Akira Toriyama, as well as Dragon Ball Z, Dragon Ball GT, and Dragon Ball Super.

Originally a human, he is constructed into a cyborg by Dr. Gero like his twin sister.

[Spoiler] 17 is a mass murderer in Future Trunks' timeline. [/Spoiler]

[Spoiler] Number 17 is killed when Cell explodes, but is wished back to life along with the other people on Earth who had been killed by Cell. #17 has his explosive device removed by Kuririn with the second wish. The last time we see #17 in DBZ is when he is in the woods donating energy for Goku's Genki-Dama. Considering the fact that he is alive during the Kid Buu saga serves as a testament to his good soul: the wish that revived him was one that Vegeta made asking for only the good people on Earth to be revived when it was restored (Kid Buu had previously obliterated the planet in a single attack). [/Spoiler]

He later returns as one of the ten members of the Universe 7 team in Dragon Ball Super,

[Spoiler] and ends up sacrificing himself to hold back Jiren. [/Spoiler]

(Source: Wikipedia)