I have been eyeing it for my +10 Eirika. It would be pretty nice to be able to give her a movement assist, while still being able to give blade tomes +6 to defense and resilience, catapulting them into action. She'd also get +12 to def and res because of her refine!
Yes, Eirika is one of the units I have most in mind. I also have her +1 merged and refined, probably gonna +10 her eventually. Then again, I do have her in a Tactics team already, I'm not entirely sure what to do.
Armour units are a interesting choice. You could run a 4x Ward Armour team, all with Swap, and have one of them with Def/Res link.
Any tanky unit in both stats can use it well.
That's also a solid thought. Unfortunately, I don't know which of my armours could sacrifice their B slot in favor of Def/Res Link. But I'll keep it in mind, I might not have given it enough thought yet.
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes