I doubt it too, but if it is a hoax, at least it will be proven to be a hoax.
What is not a hoax is how God is able to change us into the image of Jesus. So, in a way I guess you might be able to say God can shapeshift our personality from our selfish image, to become gentle and humble and all-loving like Jesus and so pleasing to God. Of course, "shapeshift" is not really a correct word, because God changes our nature, not only our bodies' shape.
So, this needs to first be getting our attention. So, if some demonic person is being used to trick your attention away from this, this is a hoaxing of your attention. And, by the way, if someone you have never met can get your attention so much, consider how that person can have heard about Jesus or certain Jesus people, and this is already dealing with that person's attention . . . though he or she has never met Jesus or those people.
So, I would say do not limit to yourself what can be done for that person.
And while we are first about growing in Jesus, God can have us praying for any and all people. We can reach them through prayer, maybe we could say first of all > and, by the way, you might feed on what our Apostle Paul says to do, "first of all" > 1 Timothy 2:1-4.
And then God can make the way, but with us first obeying Him, more and better moment by moment in His peace >
"And let the peace of God rule in your hearts, to which also you were called in one body; and be thankful." (Colossians 3:15)
And we need to be with one another, no lone-wolfing >
"with all lowliness and gentleness, with longsuffering, bearing with one another in love," (Ephesians 4:2)
And we share as family while we reach people; our family example can speak louder than words. And by obeying how God has you sharing with family with His people, your obedience can get many blessed, like how Abraham has gotten "all the nations of the earth" "blessed" because he obeyed God's voice > Genesis 22:18.
So, make sure you are first sharing with God and submissive to Him in His peace, plus sharing as His family. And then it is possible that He will have things work out so a demonic person is reached > possibly by your prayer, possibly by other Christians while you humbly submit to God.