Ayra could give away Swift Sparrow, though many other units carry the skill and a merge would increase her Spd, which is greatly appreciated for her. I think merging is marginally better.
WF!Hinoka is really nice for Atk/Spd Bond on Healers that don't have many good options, but Flier Guidance and Flier Formation are pretty nice utility skills for other Fliers. However, note that Flier Formation is already a seal, so you might not want to fodder her off for that. Fodder mainly for Atk / Spd Bond.
Saber only has Shield Pulse and Slaying Edge+. The former isn't really useful on many units due to the offensive nature of the game, while the other can be obtained by inheriting Killing Edge+ and refining that. You probably save a few Refining Stones by foddering off Saber, but that's about it. Maybe fodder for Slaying Edge+; otherwise, keep despite his bad IVs.
NY!Takumi has the Kagami Mochi+, which is Barb Shuriken+ before Barb Shuriken+ was in the game. This may be useful on some dagger units, but a lot of them like to focus more on debuffing, so Smoke Dagger is probably more used that Kagami Mochi. (Also, Kaze with the Barb Shuriken is in the 3-4 Star pool, but does require at least 20K feathers.) You also got Atk / Res Bond, which is a pretty nice skill for Healers, though might not be as good as Atk / Spd Bond. Fodder only if you don't like him, and probably for Atk / Res Bond over Kagami Mochi+.
Innes... has got Cancel Affinity and Fortress Res, which aren't that used. The first does have nice utility against -Raven tome + Triangle Adept units, but those are pretty uncommon nowadays. Fortress Res can be used for better Ploys, but that already exists as a seal, and I don't know if you really want to drop a unit's Atk stat for better Ploys. (Maybe on supportive units?) Fodder only for Cancel Affinity to offensive Archers, preferably one that runs Firesweep Bow+ since they can't really utilize any other B-Skill well; otherwise, merge.
Karel is pretty bad as fodder outside of Wo Dao+, which Athena also carries. However, if you are willing to invest in Karel (and your Karel's IVs aren't that horrible), he is actually a pretty nice unit. Fodder only for Wo Dao+ to an offensive Sword unit like Soleil.
Ares should probably fodder his Brazen Atk / Def to Myrrh unless she has Distant Counter. The boost in both stats are really nice and will factor into Great Flame's effect. Nowi would prefer Steady Breath over a Brazen, but she can run Brazen if you don't have it or want to try a more unique build.
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