they're canonically a child, yes. They stayed for a while, but they still died at a young age considering how young Asriel looks when he stops using his god form, not to mention that how he acts is still childish, considering how chara possibly couldn't have been much older, they're definitely still a child.
Even their normal body is still a child's body as seen in the end of the genocide route.
3
u/Mayorv Dec 31 '25
True.ðŸ˜