Thread:Navi King1/@comment-5956954-20160312040935/@comment-5956954-20160312215634

asgore put chara's body into the coffin, but toriel took it back and gave it a proper burial under the bed of flowers which was where chara fell when they dropped down into the underground.

asriel was not buried at all, but just had their dust sprinkled on the flowers, which in turn, gave them his essence to live on in that thing, making it possible for him to come back to life. That would be flowey himself according to the true lab entries.

i might be wrong, but this is fairly accurate since asriel is at the very beginning of the game after the true pacifist run "taking care of these flowers."