Was on the same boat, but I decided that stuff like Beruka or Bartre are safe because I open them all the time anyways. Also, not so many skills to legate. Basically I give a cursory glance, something that I would like to legate? Keep a couple. No? Merge or send home. Reach the point where some of the 4* I opened so much I don’t care about keeping anymore.
Failed to open any wedding dress character, but opened a 5* and she seems decent enough (also I have no dragons whatsoever) so I guess is good enough.