Serela, I was taking the high cost of Southern Cross(10 MP) and Execution(12MP) into account when I said that. Running out of MP is a situation that I don't want to run into is all, and Orb of Earthin just barely covers the cost of Execution. Since library costs are so low, maybe it's possible at that point to level up Akyuu's low affinities to 100, as well as throw a level in each of those 198 affinities to make them an even 200.
Yeah, but you have to keep in mind you also have max mp. She already starts with a whopping 30, not to mention it'll be over like, 50 from the initial levelups. Concentrate+next turn with only her innate abilities will give her 10 mp. You're really not gonna keep her out so long she'll run out of mp using Super Incantation- that's only 2 mp every two turns from Execution, a move you'll likely want to switch her out after using anyway! (When elements allow she'd really want to sub for Start of Heavenly Demise, though)
At that point you can do more than turn her 198 affinities into 200, easy :P But yeah with her cheap library, raising her affinities shouldn't be too hard. Along with of course, equipment, since if you're going in on offense Akyuu you'd probably give her some of your sweeter gear too. If you really go in, Akyuu should be pretty awesome, but it'll be costly on gems. I'd probably just stick to using a normal glass cannon over a glass cannon that needs to concentrate before nukes. (You could swap her out after the concentrate too, I suppose, but now you're doubling the turns used for swapping her and it's like, why aren't you just using someone else)
You can also just dump a big TP main equip on her and resurrect through everything as she blasts away, but she'll only last so long. The resurrection is the main thing that makes her potentiallydurable after tweaking- if she can generally take hits, and resurrect the big ones, she'd be golden.
Last, is it possible to play with the expansion with the old content remaining translated?
I imagine you can throw in the translated img1 but that's probably it. The only thing that's been in any patch notes I've read about old content rebal is just that a few characters have new skills from the get-go; Kogasa, Cirno, Meiling, Keine, Youmu, Alice... and Utsuho's moves were powered up, along with Cat's Walk, Knock Out in Three Steps, and Flandre's first two moves were powered up whilst Lavaeteinn was powered down. Plus some bugfixes, like Fighting Spirit's damage reduction didn't used to work.
Edit: Across the board the plus disc cast is kind of super weird in that they're all built around basically exclusively really long boss battles they can stay in and use their gimmicks on. Unless Endless Corridor random encounters get really rough, it feels like they were all made for a meta that this game frankly isn't in 90% of the time. I guess it's a sign of what kind of encounter types we can expect in those 999 floors.
Whaaaaa? This only really applies to Shou... I don't know what you're talking about. Miko looks -awesome-, Futo looks pretty great, Mamizou's fine enough (only -special- after the corridor, admittedly), Koishi is solidly good looking (and wonderful if you're using earth spirits), Kokoro... a bit more confusing but she seems nice, and Tokiko looks very useful.
The only one who has a gimmick reliant on long fights is Shou. :S Futo only really needs at least 1 plate broken at any time (assuming defensive stance) and Miko synergy+infinite corridor skills let her start the fight near max plates almost immediately later on. So yeah, it's pretty much only Shou that needs a long fight. Mamizou has an 86% delay normal attack to get her elements with, should probably sub Sorc which makes that normal attack actually pretty nice DPS -anyway- with it's speed and Empowered Normal Attack, and once she lands on a boss weakness element (usually there's more then one, which means 25%+ chances) she never loses it for the rest of the fight.
In response to the wall about Akyuu... Akyuu is really weird but that's just to be expected. Also, we already have data on subclass attacks- Southern Cross and Execution are like 200~240% mag and Execution should have good mind piercing. Start of Heavenly Demise is like 350% mag which is amazing if she's fine with being locked into SPI. If you tweak Akyuu up a lot she would be pretty great, taking minor hits and resurrecting through big ones whilst blasting with big skills, and works well with Renko's Start of Assault or whatnot for another 25% damage (As renko will be great for any single-big-nuke attacker). Buuuut you'd really need to invest into it for her to be worth any hassle compared to just using Marisa or Suwako or something for glass cannoning, it's true. (Hmm... Start of Heavenly Demise could even give Suwako an alternate nuke when NTR is resisted.)
Meanwhile her support might be pretty useful in boss fights with telegraphed evil moves ("Oh no, it concentrated- lets make two people invincible and Akyuu tanks it herself with 12 tp"), and her status invincibility skill looks pretty useful overall- cheap, targets the whole front row, only 10% chance to wear off... you could have that up a lot in a fight where it was necessary. Irresistable PAR effects have been mentioned a lot, now that'd be something you want to resist- or megapowered DTH attacks.
There are still some tough nuts to crack in plus like Diamond Knight or Grandgon (although the former resists SPI), and Kaguya could be helpful against those. Also until you hit the plus disk postgame, pretty much every basement floor is filled with SPI-weak enemies and Kaguya could do major damage to them. Outspeeding things is a concern but you could have Aya or Rinno with SPD bonus or a brigade of Monks to switch her in.
Party design is hard with this ridiculously huge cast. ;_; Although I'm not worried about "it's weak to SPI!", I'll just keep in mind someone -else's- SPI attacks will get plenty of use, I don't want to use Aya and my party slots are in extreme high demand as it is @.@ I could always keep Kaguya's library levels as they are instead of Reincarnating them off and swap her in for a resistant boss here and there, I suppose. I'm NOT the kind of guy to swap my party around for specific bosses or areas in ThLaby, but people with a glass cannon build can do it with minimal investment, so I could do a couple characters for that.