I would recommend to remove 'adventure' from the theme section. It doesn't describe a theme.
I think adventure and action are two of the most meaningless words in gaming.
You could also explore taxonomy of main characters or NPCs, but those would be a sub category's of 'theme'.
Tried it before:
Fairys
Gnomes
Trolls
Giants
Elves
Dwarf
Goblins
Vampiares
Werewolves
Reptilian
Insects
Cyborgs
Robots
Dinosaurs
Wildlife
Zombies
Dragons
Ghosts
Demons
Alien
Martial Artists
Cops
Criminal
Soldiers
Knights
Assassin