A citizen of a settlement. Generally they only have the most basics of rights on the deed; however the mayor (deed holder) can configure each deed member to have any of deed rights.
On death, a citizen can chose to re-spawn at the settlement they belong to rather than the spawn deed, and also choose to re-spawn on deeds allied to their own town if they are within 50 tiles of the allied deed token when they die.
If the settlement is a democracy, citizens can use the /vote username command to vote for a new mayor. 51% of the votes are needed to elect a new mayor. If it is a dictatorship, then the mayor cannot be replaced by the citizens of the settlement.