I’m going to start by saying I absolutely disagree with the “A” placement GP gives her. BB is a gimmick, pure and simple, that even when it’s needed (never) is difficult (at best) to use.
Self-Modification EX continues to be a wonderful skill. The crit damage + crit absorb, both for 3T, is a great way to increase your damage potential. But BB…isn’t JAlter, and doesn’t have an extra ~2k attack laying around to make the best of this. With her neutral damage (both against classes and in general being x1.0) this raises her damage on crits to about the level of actual class advantage…but still somewhat low, bc she’s only got 11k attack.
Her 2nd skill is bonkers, with so many effects that other skills wish they were. It’s the 50% charge of Eresh or LArtoria; the 50% NP Damage of Helena (Caster); the Heal/Evade of…well, a lot of people have Evades and Heals. With less CD than many of those skills have for their lesser effects. If it has any weakness, it’s that the Buster buff of 20% is selfish instead of party-wide like Helena, Sheba, et al. have.
Her 3rd skill is the gimmick. Passive 2030 is good, really good, but locking command cards for 3 turns…it isn’t that I don’t see the potential use, it’s that I don’t see the actual use. You can go on YouTube/billibilli/etc to see many examples of it being used, don’t get me wrong, but how many get to do that on the first time vs. countless resets for card RNG? Most 3T strats (even if you’re not Arts or Quick looping) require as little RNG as possible - even the slightest bit off, and your buffs run out and you stall. Yes, BB can guarantee that your Archuria gets an NPAAE brave chain for 3T straight to NP 3x in a row without a problem…but how often is that needed, first of all, and again, how many resets to get both Arts cards on T1?
Now, for BB’s NP Damage, even with buffs (NP+, Buster +) it isn’t good. The OC effect of maybe loosing another Charge can be nice for CQs (Drain is one of the best uses of Orion’s NP) but the damage will be potato most of the time. For Welfares, I didn’t check the full list but Nightingale, Jalter Lily, Rider Ishtar, Santa Alter - all hitting harder on neutral targets vs her for wave clearing (heck, Caster Liz is only about ~500 or so lower on average and she’s entirely forgetable). Do they have the utility BB does? No, not really. I’ll admit that.
BB just seems out of place. For wave clearing and damage she’s just bad (but her NP and 2/3 skills imply that’s the intent) and for niche supporting, her skill is just too niche and RNG-based to be wonderful.
Summon for the memes in my opinion.