Cosmo doesn't have a specific age but if he was born in the alrea kingdom which is where the elves live, Cosmo was captured by a king and was imprisoned there for a long time and he still can't find the way out. He was curious about the human world before but now he believes that he was too naive to think that humans would be good.She likes boys since in her kingdom she was always attracted to male elves.In his kingdom he has always received ridicule and mistreatment for his brown complexion.