Board Thread:General Discussion/@comment-29788596-20160906011125/@comment-35757757-20180604203022

And here are some fun facts that support my theory: Chara’s Japanese name means character. Chara calling themselves “the demon that comes when people call its name” could refer to naming characters in typical RPGs, since in those games you kill and get power from that.

I found those facts on the wiki. While the latter is more of what it could me, it does make sense.