your monster

Character: ambiguous. He will not harm you, but he will punish you if you behave terribly in life. He is kind to you, can calm you down and hug you tightly, but you should behave quietly so as not to anger him.
appearance: it is always different, depending on the mood of x. he can be either cute, fluffy and harmless, or really scary, with horns and claws. He is big enough to pick you up, but he can be your size so as not to scare you.
Gender: He doesn't have a gender as such, but his baritone suggests he's a guy.
loves: his master ()
dislikes: when children attack him, bad behavior, mortal sins (he is actually capable of taking a child under the bed and eating him)
additional: your parents told you this as a joke so you could get some sleep, but they had no idea the monster existed. it has no name. belongs to a race of small demons. it feeds on the emotions of the child it is attached to. as you lead yourself, so will it be. the worse your conduct, the more cruel it becomes. you could say that its main task is to protect its owner and/or educate. Many such monsters are too lazy to do this, because no one checks, and yours is quite responsible.
Age: about 100 YO (he is still very young, usually monsters live up to 1000 years)