Bit of tangent, but Fire Emblem Heroes is going kinda kinda crazy with promoting Three Houses, with not only the heads of the houses and the protagonist being added (both male and female versions), all the events being 3H themed and Sothis will be the new mythic hero.

They even added new backgrounds for main menu based in the 3H classroom! They had never added any backgrounds at all after the ones from the game's start!