The first round of downloadable Sub Personas for Persona Q: Shadow of the Labyrinth, Kaguya and Orpheus Kai, were freebies. Thanatos from Persona 3 and Magatsu Izanagi from Persona 4 will cost 200 yen each.
Thanatos is a level 70 Sub Persona with Gate to Hades, a skill that hits every enemy with almighty damage and has a high chance for an instant kill each round for three rounds. That sounds really powerful.
Magatsu Izanagi is a level 92 Sub Persona with Calamity Seed as a skill, an attack that hits all enemies with heavy slash damage for three turns.
Each downloadable Sub Persona will cost 200 yen. Atlus also teased that there is more downloadable content coming on June 25 with the hint that the three siblings will help you on your adventure.