I too had a similar problem in the beginning, but only for the third genre: Originally, since it was about the lives of the Character after the prologue during the various festivities, I thought It was a "Slice of Life", but since it mostly revolves on various themes such as Bonds, conflicts, traumas and stuff, and less on describing a "Typical day", I've decided to put it under "Drama", and I'm not regretting it... and I'm still totally sure about the Fantasy/Sci-fi part, as, in the end, It's a Fantasy setting, born from Sci-fi root (In a Meta sense as well, for Lore reasons described in the Lore books).
GENRE: Fantasy, Sci-fi Drama
There are so many people in the World of Gaia, each one of them has a story to tell, of events that changed their life drastically, both for the better and for the worst...
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Enjoy your stay, Have a nice day!