In the English version is Boogeyman. (But I think it's John Wick :D So I just use what my parents use when I was kiddo: Be good my son, or... the Mumus is coming for you.)
First version: I was maybe 5 or 6 when I drew. 2nd It's just a 2019 sketch.
(Yup, the tail, wings, and claws is totally shameless. Sorry. I remember, I just want my own character.)

Step by step video: https://www.youtube.com/watch?v=PiVpTt7ZMzQ&feature=youtu.be&ab_channel=JoshDancato