Ibaraki-Douji

If you have the extra exp, you should level all your 4 stars. Having another berzerker isn't a bad thing.

I have Ibaraki NP 2 lvl 80 along with lvl 92 Hercules.
Ibaraki as my main ST berserker then Herc will come out if everything went wrong.

She's my main Assassin boss killer ( i only have Medea lvl 70 NP 5 as my only ST Caster/boss killer ).
Also she do her job pretty well, for some fight that have multiple enemies with different classes i always bring her in or use Tamamo Cat to destroy things.

Zerker is one of the best medicine, one thing is they're pretty fragile.

No, don't waste your mats unless you like Ibaraki or something.

Yes. She offers a different kit.

There's not much you'd use her for that Herc can't do better, but if you wanna switch things up at any point Ibaraki's pretty good. There is also a chance she might give bonuses in future events, so there's that (confirmed she will give bonus in Onigashima rerun next year).

Yeah dispite all the memes she's quite good, she has good hits on her quick card and extra card so if you manage to get her ABQ brave chain she have no problem gaining her own np and her np being buff remover guts wouldn't be a problem and while she's not as durable as herc she has debuff remover tied with self heal and defends buff as well as team attack buff with np damage buff as damage steroid