Her S2 passive has an 80% chance (100% max) to dispel one debuff AND be granted a 2-turn defense when attacked. That means any single-debuff attack against her from peeps such as, oh, Dark Corvus (provoke), A.coli (stun), or even ML Baal (sleep), gets purged instantly whereas C.Armin (barring high eff.res or immunity set) would lose the first round right there and then.
Her S3 also packs a wallop. If you use it on someone at 30% or less health her dmg output increases 300%! Great for finishing off squishy units.
In some ways she shares a similar role to C.Armin and that's to be a tanky bait against dark units, but she's also very much her own thing. Would I immediately rush her to 6*? Nah, but I do think she's very underrated.
My high level gear usually gets all the effect resistance and then some, if you know what I mean. I'm probably good.
Jokes aside, that s2 actually sounds pretty nice. Maybe I'll take her for a couple of test runs once I'm done building the units I'm working on. Cheers for the tips.