It was only a matter of time, but Hel: Death Sovereign will be the next Mythic Hero to arrive in Fire Emblem Heroes, from 30th July 2020 (UTC).
If you haven’t been keeping up with the story of Heroes, Hel is the primary antagonist of Book III; she’s the ruler of, well… Hel. Previously, her two loyal generals Lif and Thrasir became available as Mythic Heroes.
You can check out more info about Hel, plus the rest of her artwork, via her “Meet some of the Heroes” page.
The Heroes accompanying Hel in the upcoming Mythic Hero banner are…
Red: Legendary Ike, Legendary Roy and Altina
Blue: Fjorm, Legendary Tiki and Fiora
Green: Thrasir and Legendary Edelgard
Colorless: Eir, Fallen Corrin (F) and Leila
Please continue for a look at Hel’s abilities.