Thank you for the kind words and for loving the characters (and NotA) !💖
I'm happy you caught the little reference too, and to answer your question...the character you mentioned is actually an easter egg from another of my projects (called "Fujiwara Bittersweet", I'm currently working on a remake though) and he is indeed kind of a little troll, even in the other game (> w<)/✨
Incidentally he is also the "non-official" mascot of the studio, and the actual studio's mascot/logo is a black cat in reference to this character, haha x)
Thank you again for your comment and I hope I answered your question ~