User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5812567-20121215171457/@comment-3146930-20121215205627

You do notice that we have pretty much only seen minor gods in The Heroes of Olympus series. We have seen Iris, Nemesis, Hercules, Boreas, Khione, Thanatos, and Terminus. The only Olympians we have really seen are Hera, Hephaestus, Aphrodite, Bacchus, Mars. Pluto and Minerva do appear, but only in flashbacks. and don't really have a huge role in the series.