Historical, fantasy, magic, horror, supernatural, survival, vampires, demons, pirates, mutants, ghosts, romance (FxF, MxM, MxF) (Romance should be part of the plot and not the whole plot in itself), etc.
Iwaku triad is a card game and iwakumon is ... a bit like pokemon but with iwakumonsters.. I have only played it for five minutes so I don't really know what it is xD
You can find them in the game section which you see between blogs and what's new.