Finally, after I don't know how many years wanting to do it, I have created an original character.
She is Zeiza (or Iza for short), a character who isn't made to wear diapers, instead she exists to make fun of the girls in diapers that I draw as another way to humiliate them.
Iza is a loving but annoying little sister, always making fun of her diapered big sisters, but also taking care or playing with them, she is not a brat, she's in fact very mature for her age, which is why she's allowed to take care of her "baby" sisters, but she just can't resist the pleasure of rubbing in their faces the fact that despite being younger she doesn't need to wear diapers, unlike them. She really enjoys the blushing faces of diapered girls.
Her right eye has a mark, I call it "The Queen's Eye" and it allows her to hypnotize, change the memories and personality of those who look into her eyes. But instead of using it for something boring like conquering the world, she simply uses it to treat herself to teasing diapered girls. Convincing the ones who don't know her that she is, in fact, her little sister and making perfectly potty trained girls into diapers dependent. She doesn't do mental regression, she leaves their minds intact so they feel the shame of wearing diapers at their age.
Anyway, I'll start uploading drawings with her teasing big babies so stay tuned.