User blog comment:Besteverunited/Do you guys think that Natsu is the only demon Zeref created or do you think the other dragon slayers were created by him to?/@comment-24784846-20150518221531/@comment-68.179.188.168-20150520052748

@God To be fair I think he has several times if you count the Tower of Heaven XD haha it's always someone who has a connection to it. In all seriousness though it's not impossible but highly unlikely.