{Fillbert looks up at Yellow, shown here as a yellow rectangle.}Yellow: ASK FILLBERT: What's your gender?Fillbert: What's a gender?CC-BY-NC mincerafter42.github.io/fillbert
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.