Here is Takahashi Ai. 

Age: 18 
Birthday: September 8
Height: 5'4 in / 162 cm
Weight: 115 lbs / 52 kg
Hair color: Black
Eye color: Bluish Gray

This is a reference picture to Hatori when he goes to "meetings". When he's around the estate, he wears clothes that he normally wears in the 2019 anime.