Regarding Junas` Gender and Storyline.

IDk about you,but i think JMS has nothing left to add to their exclusive areas,unless they make a 'present' tokyo lol

(would be still cool in my opinion)

What about Sengoku? A great period in the history of Japan. A lot of fighting and I smell plenty of bosses with great undefeatable Oda Nobunaga in the end.
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Isn't Marle (マール in japanese version) a female character in Chrono Trigger? And Dunas is a name of a Digimon ^_^