system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragon Ball Z] Why didn't the gang rebuild Android 16? Or if it was too much to rebuild him, surely they could have used the dragon balls to wish him back?
gpt
While not canon, DBZA did add a touching side note that addressed this. Android 16 *did* have a soul, but he did not come back when they wished back all of Cell's victims because he did not wish to return. 

His programming to kill Goku meant that life was a torment for him, and he found peace only in his own death (and probably in the fact that goku was dead as well). 

His purpose fulfilled, he enjoyed his retirement studying Other World ornithology.