Fillbert The Empty Space Cat

2021-W22: gender

{Fillbert looks up at Yellow, shown here as a yellow rectangle.}Yellow: ASK FILLBERT: What's your gender?Fillbert: What's a gender?{Fillbert frowns.}Vivi {offscreen}: Oh right, I never gave you a gender!{Fillbert smiles and a large sign points to them.}Sign: NYANBINARY

Commentary

When I created the character of Fillbert, I did indeed just not pick a gender for them. This means Fillbert is agender, which falls under the non-binary umbrella.