I thought I'd take a closer look at this seasons arena meta by sampling 100 different teams found at the 740 point range. To some, this may be of no surprise but here are the most used units for this Fire & Earth season:
Brave Hector 44%
Legendary Hector 36%
Legendary Robin 32%
Myrr 26%
Grima 22%
Effie 22%
Zelgius 20%
Legendary Ike 18%
Summer Young Tiki 14%
Brave Ephraim 14%
Nowi 14%
Hardin 12%
Sheena 12%
After these heroes it was all a pretty random mix, majority being armor.
I saw ALOT of Robins for some ungodly reason. Maybe it's the weapon? But Brave Hector is understandable with Bold Fighter and all. Even I run him. I also run Grima, and I have seen ALOT of him as well. The rest seems pretty normal, easy to merge units with good refines or abilities.
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes