In essence though this leads to the question, IMO, of “How frequent are (difficult) sole Berserker bosses?” for Abby, and “How frequent are waves of Berserker mooks, and what does Hokusai bring to the table offensively that makes her an outright superior choice to others with charge?” Then finally, the obvious self-explanatory defensive question, of how much that class adv matters in practice. So, during stuff like MHXA or Eric in Gilfest, or cases like what crumbling mentioned (beyond which I can only think of the LB4 Berserker/Assassin boss fight offhand).
Yes, they are objectively “effective” insofar as class adv is always king, but how effective are they versus the trade-offs you make using them as opposed to others for deleting or surviving against Berserkers? Or heck even during basic farm periods. Abby deals 45-76K against Berserkers. Her neutral damage, which is even harder to argue for than Avengers due to the x1.0 damage mod, is naturally less appealing.
If you have Jalter, she’s already relatively as good if not better at deleting specifically Zerkers afaict, in between her Self-Mod and other steroids and junk. Heck, I remember finding an incredibly bare-bones budget comp where she was used as the DPS vs Eric in BINY 2019 and won handily. I can’t find it immediately… will edit it into this post in the coming days, alongside other stuff. (I mention Eric because that battle can’t be cheesed with Euryale/Orion.)
If you have Bedivere even NP1, he has an equal charge to Abby (and actually strictly higher in 3T scenarios), and more damage (71K vs 45K-76K NP1-5 for the eldritch daughter as mentioned), at lower Cost, for farming.
Mecha Eli is also effective against Zerkers, and deals 91K on her burst turn (although true she falls off immediately after, but proper team comp plans around such).
If they’re a Berserker Male, Euryale cleans them up on a budget and has an almost-similar battery (again strictly higher in 3T scenarios).
If you have any of Chloe/Ridertoki/Shiki, all of them have similar or higher batteries and stronger immediate damage, and two of them (Chloe/'toki) are well-noted for their ability to follow it up with more. To say nothing of the former two and their being especially BG-compatible.
We will also be getting San(ta) with her 20% charge (similar in 3T scenarios), who deals 109K at NP5, on top of being able to support the turn after with her star bomb of an NP (or do less damage and give someone an NP Up).
If you have Carmilla, post-upgrade her NP1 deals more vs lady Berserkers than her, and she’s got a similar charge.
And a lot of those are just budget options. If their main appeal is ostensibly deleting Berserkers, but that job can generally be matched or done better in most cases by freebies or just other units you might obtain, in general. Heck, the recently released Yagyu has markedly superior damage, can also be nabbed via the GSR, and can reliably shut down enemy offenses which IMO is much more effective for shutting down dangerous enemies here despite class adv in Abigail’s case since it also helps the entire team (though granted, is shut down by regular debuff cleansing). If looking at neutral damage/mixed mobs you’re running Zerk.
So that leads me to ask, “Okay, what about buff removal?” Martha is permanent and can clear buffs at the tap of a button. Tristan appears not-rarely as a rate-up SR, and can also remove buffs, alongside being especially BG-compatible thanks to his 50% charge (although less 3T-compatible due to the annoying self-NP Seal). Hime is a permanent SSR Swho’s like a weird higher Cost Shakes-like in terms of buffs, and can also strip buffs. Jack is a permanent SSR who can also strip buffs and deal way higher damage if against ladies. Later, Alex gets AOE buff removal. Shinjuku Avenger is a permanent SR who can also strip buffs. One is outright free, three can be chosen via the GSR tickets. None of them also have her AOE charge and/or NP Up, but the NP Up can at least be imitated through Santera’s targetable one for your most important unit (DPS).
Which then leads me to wondering about surviving Zerks, and subsequently how common and/or generally dangerous they are. Crumbling mentioned one actually dangerous case (i.e., post-Part 1 because P1 is trivial), and that she gets deleted despite class adv.
There’s Shinjuku’s Berserkers, against whom you can handily clear at least half with a combination of Euryale and Bedivere, before handling them with your strongest AOE unit(s).
There’s Agartha’s several Berserker fights. One is a Male Berserker, so Euryale/Orion/TamaLancer clean him, and also just any strong ST attacker nuke-wise, before only having to deal with one bar for the girl Berserker, but she’s handled similarly when actually fought properly. Then there’s the Berserker/Rider almost-penultimate fight, although the Berserker also has an AOE basic attack because screw you lol.
There’s the Berserker/Rider (… again) fight in Shimousa, which could literally just be handled by Bedivere -> another strong ST follow-up -> Assassins; that’s what I did, by throwing Bedi then later HFH and others at the duo. Meanwhile, the Berserker’s got an AOE NP
Definitely, you can just run her due to SSR stats, variety of buffs, and buff removal (although that won’t help you with the stacking of unremovable offensive buffs regardless)… which, well, there you go I guess. Obviously, anything goes. You can use whatever, and the game is rarely very punishing, and thus far even when it is punishing there are counter-measures for that. She can even be ran during CQs like the aforementioned Eric fight, can be used as a soloist for the upcoming Setsubun vs Golden for another example, or as an Arts-stall DPS with the typical defensive core as shown in this example against Setsubun’s CQ. You’ve also got the GDGD 2 rerun CQ, which I consider an absolute joke not even worth mentioning, but might as well while I’m giving examples of usage despite my not thinking she’s worth going for (focusing on Abby because this is already a lengthy post). Meanwhile there’s this with her vs Gilfest Ecchan although the comp is pretty whaley, and even her being ran class neutrally vs Gilfest Leo (fun fact at one point she gets critted for 15K), and Gilfest Sheba. And her vs CCC BB (and MHX in the same event). Also her vs the Jaguar Girls in Gilfest 2018 (although it also uses PG/Outrage). I primarily link CQs because generally Story quests are a joke and you can obviously run her against whatever the heck, I generally run my Sparty during non-boss story segments (and frequently during bosses) because I like him a lot. So it’s like, that goes w/o saying, obviously it’s viable.
Far as Abby and Oui go it’s comparing apples and oranges, their kits are built and they function very differently. Both are heralded as CQ girls, although Oui is more acclaimed for sweeps (and I get why), so I guess I’ll give it to her.