I have a feeling the TikToks are the result of Jonathan trying to introduce Emilia into domdie, which his why this alternative Emilia says she's an only child, changed schools and doesn't have pets and so on. Jonathan told her to make up a world of her own, just like he did when he was her age, so she did. It's what she wished her world would be like. I think his intentions weren't bad, but as per se with Jonathan, his boundaries are so blurred and his social and emotional skills so underdeveloped that he can't see how he's setting her up for a lifetime of mental health issues rather than giving her a coping skill.
The animations looking like teenage girls is also likely due to Jonathan's limited animation capabilities, not necessarily because he had something sinister in mind. The end result though is the same and it's high time Jonathan understood what he's doing out of stupidity and spite is dangerous and that he's causing harm to the integrity of those children.
The fact there there are only a handful of videos, all in a short period of time with the account then being left abandoned also points to Jonathan in my eyes, as he always starts abandons things like this.