Xadune allows you to play a ‘Planeswalker’ character – a character from another game or story of any race. However, the character will suffer from ‘Walker Sickness’ and will start at level 1, just like everyone else. For logistical purposes, the character will be considered Human.
There are negatives to playing a Planeswalker. They will not have the common knowledge of Xadune that native characters will have. Planeswalkers may be treated differently in-play be Player Characters or Non-Player Characters. They also will suffer environmental effects on parts of the planet that native characters will not.
Playing a Planeswalker character also counts as taking a culture packet, so keep that in mind if you have other character concepts.