Guanyin

Man presenting
He always wears formal white clothes no matter where he goes and always carry around a starbuck-like cup. He also always has his dish behind his head and often travel in his lotus.

Woman presenting
In an arc where she was woman presenting, Guanyin wore a t-shirt and skirt, sometimes with an apron. She also had long hair and kept the dish behind her head. She also is seen several time in the past in which she had special clothes, always white.

Personality
Guanyin is a very calm person and can deal with a lot of things, like being a boss and taking care of three kids. He pay a lot of attention to the notes of Nezha, Longnü and Hong Hai-er and expect them to be good at school. If someone annoys him he throws a few drops of his "coffee" on them, most of the time to turn them into horses.

Mythology
In traditional mythology and folklore, Guanyin is agender and shifts forms as the need arises. However in media adaptations, creators tends to lean towards one direction, which most of the time is a male representation, with a touch of genderfluidity depending of the need of the story. In itself, we cannot say that Guanyin has a gender (by our definitions) as he's a god and therefore doesn't bend to the same rules as ours.

Trivia

 * The creator of the wiki called dibs on Guanyin's pronouns, it is now fae/faer because it sounds like fée (fairy in French).