Whom should I build for fun?

Titania if you like her! I want her to be a goddess like she is in Path of Radiance!

You could build a 5star or 4star+merge Virion/Hawkeye

I have a brash desperation florina with death blow, brave lance+, iceberg, and def ploy. if you keep the enemy team completely spaced out and there aren't any tanky ranged units, florina can absolutely sweep and because of the nature of brash assault, she's always in wings of mercy range.

Of course, this set can work on a lot of other lance fliers and a lot of them do perform better than florina with it but hey why not

Make a brave sword death blow laslow. At 5* he has 38 base attack with atk boon, so he can do lots of damage and you most likely have one in your box if you don't send him home.

(A)Tiki! My friend has her at 5* +3 and says she's totally worth it and fun to play with

Cecilia TA Raven tome. Seriously underrated.

Double Savage Poison Jaffar. Pair him up with 3 dancers with Wings of Mercy or 2 dancers and 1 Brave Lucina and watch him chip all the people down. Hoping the weapon refinery will make him even more viable.

How off-meta do you want to go? Like Fae and Cecilia are both not considered SS or S-tier units but are fun to use and very good meta counters with the right builds. Are you looking to go further off than that?