Shera
- She does what she used to do, but better.
- HP is a bit on the low end for a 7* mitigator... don't these guys typically want to be the bulkiest units in your squad? Other stats are pretty average. 40 drop checks on normal attacks is nice.
- She's got a single target BB, so don't think too hard about using her in the arena. Unless you really don't have anything better - she makes a somewhat viable lead, at least.
- Shera's LS provides some major BB-spam support, between 25% BB cost reduction and 30% BB fill rate she works out to a 73.33% increase in the value of dropped BC and a 33.33% increase in the value of BC regen, instant fill, fill-on-spark, etc.; Shera also gives the standard 20% chance of 20% mitigation that mitigators tend to have.
- A lack of any HP% hurts it pretty much anywhere, however. The net effect is stronger than Feeva in arena, if you're willing to use a single-target-BB Thunder unit, but generally speaking? I'd prefer Bestie for a BB spam lead.
- Her ES has one new effect, which all the info we have at the moment for is a google translate effectively stating "Ignores enemies' defense penetration". Without confirmation from deathmax or in-game testing, I'm not sure how far that goes - does it mean DEF always applies, DEF reductions don't happen of that DEF Ignore simply does nothign against Shera? It's a pretty big unknown, and it could vary between Shera being able to survive things no other unit can, to just a niche little thing for like, 2 or 3 major fights. She also has some BC gen when she guards, which is unfortunate - a mitigator should only ever be guarding if the enemy attacks ignore mitigation, so this part of her ES will see little value... and a mitigator should be geared so they fill every turn, so the extra will rarely be useful even when you do guard.
- So after her ES being a letdown we can look at her important bits, like her BB. It's a strong single target attack that adds 50% mitigation for 1 turn and a 110% ATK buff for 3 turns. This has one of the same weaknesses we saw on most of Nadleeh's batch, however - Shera has a stronger ATK buff on her SBB. And as a mitigator, you're probably going to be forced to overwrite it. Still, it's nice to have an ATK buff constantly - pairs very well with Melchio, for example.
- Her SBB has a very nice hit count at 30 hits - alongside her BB having 15 hits, I'd say Shera is the mitigator best supported by BC-fill-on-spark leaders. As for its other factors, well: mitigation for 1 turn (standard), 130% ATK for 3 turns (not full 7* quality but there's little difference between 130% and 140%) and 7 BC regen for 3 turns. The last part is what stands out here - she might be clashy with a couple popular units, but that's 42 BC per turn split evenly through your squad, which is a very nice buff. If you can ever afford to use her SBB, it's a very good one for that reason. Like most mitigators, she falls to the problem of needing to use at least BB every single turn, however.
- Her SBB's damage output is actually lower than her BB with a below average 450% damage modifier, but the higher damage buff should compensate via other units if you use her early enough in the turn.
- Her UBB has a hit count that is... surprisingly, lower. It also has 75% mitigation for 2 turns and a 250% ATK buff for 3 turns (which stacks with BB/SBB buffs, allowing her to buff the party by a total of 360/380% for a short period). Mitigation-type UBB are always useful, and I suppose having a little more damage is almost always useful, so it's an acceptable UBB.
I think Shera is a very strong mitigator who has very different optimal pairings due to her secondary buff being offensive rather than defensive - she loses nothing when paired with, say, Melchio and Rivera (or Reeze and Rivera, your call, really). Most of the other 7* mitigators can't say this - with those units, Aaron's DEF buff clashes, Elimo's DEF buff and status curing clashes, Zeldeus' DEF buff clashes, Edea's status curing clashes, Krantz' status curing clashes. And Shera's ATK buff is present on her BB as well, for instances where you can never really afford to wait around for SBB.
She looks bland ability-wise, but it's actually very good for pairing with a lot of currently used units
Conclusion
I think all 3 of these units are strong, just... not as leaders. Reeze is a comparable option to Melchio both as a DEF buffer and a status cleanser/immunity unit. Ragshelm is quite simply the best Injury/ATK Down inflicter in JPBF and has a very high usability in content that makes those useful, and Shera is a bland-looking mitigator that actually allows some very powerful clash-free unit pairings to exist.
Overall, then: All 3 of these units are good, so be happy if you have them.