She is great. I've merged the three copies we've got and I'll likely do it with the revival quest copy but, while I love how she works as unit (and her art), Tharja's my first red tome merge I want to do.
I made my Aether Raid Defense a themed one too. I tried making it a bit challenging to get the Aether, and I'm always entertained seeing how people defeat my team. Lol but I never get any successes, it's pretty easy to end up getting the aether.
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes