In the Japanese release, players who choose a female avatar can control the size of her breasts. This feature was removed from the English versions.

A concept sketch of a character called Reina Sakuraba can be found in the game's art book, Xenoblade X: The Secret File. The caption accompying the sketch implies she was intended to have been the original protagonist before the decision to have a fully customizable protagonist to accomodate the online aspects of the game.