I got Genny, Legend Lyn, and two Legend Robins on the banner. So much for getting the units I was really hoping for, but this is a great haul too.
One Legend Robin is +Spd -Hp, and the other is +Hp -Atk, so I'll definitely be building the former one. That raises the question: what should I do with the bad stats one? Is Res Smoke useful fodder? Or should I just merge the two?
One merge gets you a single point of HP and speed so I'd generally recommend foddering a rare skill like Res Smoke off. It is a great skill to run on any sort of tank with teammates that do magic damage. i.e. You could put it on a Fjorm or Myrrh and next turn clean up with a speedy Nino or S!Corrin. Even a player phase L!Robin would like to have a teammate running that skill.
I would rather go with merge honestly. Res smoke is the least useful smoke skill. Compared to Attack or Speed you will hardly find more than 2 units in enemy teams that have decent res and lowering the res of a unit that already has pitiful 16 res doesn't make a big difference unless you have low attack like Robin, but high attack mages won't feel a big difference
You could fodder her off for her C skill, but in general you'll find many more useful C skills imo
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes