In the anime, Tetra appears feminine at first, but it's later reveled that he is a boy. However, in the anime, it's not clear if they refer to the avatar or just the player.
Is Tetra's avatar's gender female? The wikia is unclear, making statements that his avatar is female, androgynous, and is defined as a "he" in his "New Adventure Land profile" (no idea what that is).
The wiki makes it obvious that the player is male; I'm asking about the avatar.