Candidates for LnD...

I'd go for your purely offensive units. Nino, Delthea, Kagero, Mae, S!Corrin all have similar roles. The classic is bladetome Nino with desperation, she'll never get countered if she outright kills the target with a buffed double attack.
Kagero with poison dagger is similar as she simply wants to one shot her infantry targets.
Mae and delthea can also run speedy desperation sets.

The rest have some bulk that needs to be preserved if you want to use it.
Karel could be interesting, I'd wait and see what his nameless blade weapon will do.

Kagero, its niche but having an infantry killer could help you quite a bit. I still use her on a regular team for arena assault or tempest cause I know for the most part i'll encounter at least one infantry per map. Nino and corrin would be a close second and third

IMO LnD should be used for those who can get the best use out of it, like a quad unit, or a firesweep fast unit. None of these characters really fit that. Fury fits almost all of them better than LnD. Maybe Summer Corrin would be a good investment for LnD. Otherwise, I'd just save it for a top of the line candidate.