Thread: How important are Skill Ups?

Olivie is easily among the priority rainbow candidates. 20% can be frustratingly high when you're talking about the chance to be mashed by black oni.

I otherwise mostly concern myself with things that improve attack or defense directly since they generally scale well with skill rank whereas some other great skills like Triple Shot and Call Reinforcements only get you small increases in uptime/activation rate.

Olivie, Shizuka, summoners and angels in general are some units that are really dependent on skill lv

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All solid advice. Above all though, I'd just be saving all of my rainbows in barracks until we get SAW implemented and then use them on what your team is lacking for new maps. You might also have better units by then to spend them on.

Skill-dependent classes: Angels, Summoners
Skill-dependent units: Olivie (sort of, against hard hitting physical enemies that dodge rate REALLY wants to be 100%), Holy Awakening units (Maribel and Emilia but they're both farming event units)

Outside of the above, prioritize Blacks then Plats due to the extreme likelihood you won't be getting duplicates any time soon, or units with skills that are THAT good. Then you can look ahead to Skill AW

note: not all Blacks/Plats deserve skill up priority, a few are too niche for that (like Liana) or not enough ROI (skills that have locked effect/durations like Call for Reinforcements or Nanaly's Quad Shot only allow for reduced CD/initial timer for plats)