OK, I finished writing up the e-mail I want to send 3peso. This is a summary of the details in it.
-Dragon God's Power's Divine Protection skills are nonfunctional.
-Akyuu's Miare's Great Knowledge also has the effect of Protecting Art of Wisdom.
-Shadow Kokoro has no sprite.
-Marisa's Hakkero Charge Mode does not increase the Hakkero Charge counter in the back.
-A bug that appears to increase a character's damage occurs when MP is reduced to less than 1.
-Sub equipment Lord of Robes' WND+128% effect is instead 1.28x the character's base WND affinity.
-Damage reducing effects also reduce the power of healing spells.
-Elemental damage increasing effects also increase the power of enemy healing effects.
-Koishi does not get Proof of Kinship.
-9f's additional area has an inaccessible item.
-No skill exists to increase WND damage, decrease NTR damage, or increase damage against Oni or Dragons.
-Eirin's Hourai Elixir and Magician's Magic Circuit gain no benefit from increasing the Slv.
-Kogasa's MP recovery is 32.
-Adversity's description says it is activated by status effects, but debuff effects also activate it.
-Add an additional effect to Keine's Impervious Formation Change.
-Buff the damage of Keine's Old History -Ancient History- and New History -Next History- spell cards.
-Add an effect for Youkai Mountain Alliance? and Four Devas of Mt. Ooe? to include members in the back.
-Buff the damage of Youmu's Slash of Eternity and Slash Clearing the Six Senses.
-Add an effect for Demarcation to Rumia's All-Covering Robe of Darkness.
-Buff Komachi's MAG.
-Buff the damage multiplier of Komachi's Scythe that Chooses the Dead.
-Nerf Nitori's ATK.
-Buff the TRR effect on Parsee's Grudge Returning.
-Add Resurrection to Kaguya's Awakening.
-Adjust Resurrection so that the character has a minimum of 1 HP.
-Buff the damage of Aya's Wind God's Fan.
-Change the effect for increasing Slv on Aya's Divine Grandson's Advent, and change the normal effect to set ATB to 20000.
-Increase the MP recovery of Mystia's Soothing Type?
-Remove the effect that removes status effects on Hina's Spinning More Than Usual.
-Make Hina's Role of Nagashi-bina easier to use with auxillary skills that buff the stats of the whole frontline.
-Make Hina's Sorrow of Exiled Dolls remove status effects from allies and place them on her.
-Adjust how character ATB becomes 0 when Satori uses Aya's Divine Grandson's Advent with Spell Card Recollection.
-Buff Patchouli's Asthma Relieving Medicine.
-Increase the postuse gauge amount on Reisen's Gas-Woven Orb.
-Slightly increase Iku's firepower.
-Buff Suwako's Ability to Create Earth.
-Add an HP increasing effect to Suwako's Chytrid Resistance.
-Increase the postuse gauge amount on Tenshi's State of Enlightenment.
-Add an additional effect to Tenshi's Keystone Formation.
-Remove the requirement of a status or debuff on Tenshi's Murakumo's Former Owner.
-Increase Yuyuko's firepower.
-Make Shou's Bishamonten's Rage easier to use.
-Buff the recovery power of Miko's Wishful Soul of Desire.
-Buff the damage of Kokoro's The Man of Qi Worries About the Earth.
-Adjust Kokoro's Emotion Mask effect to allow players to freely select masks.
-Increase the postuse gauge amount of Tokiko's The Count of Monte Cristo's Vengeance, Musketeer d'Artagnan's Recklessness, and The Future of Non-von Neumann Processors when not under Reading.
-Change Tokiko's Victim of Reimu and Marisa's Brutality to be an ATK + MAG effect.
-Change the effect of Tokiko's Thick Book Martial Arts to be ATK + DEF when not under Reading, and MAG + MND when under Reading.
-Greatly buff the damage of Iai Slash.
-Change the element of Aspiration Surge.
-Change Gambler's All or Nothing's demerit to be reducing HP while attacking.
-Buff Swordmaster and Archmage in general.
-Improve the effects of Ninja's Lacquered Stones and Roughneck's Wisdom.
-DEF and MND have a low effect in reducing damage, consequently buffs and other effects that increase DEF and MND have a low value.
-Characters with low HP have a hard time surviving VOI attacks, particularly against enemies with Space-Time Warp.
-There are many more useful subclass spells for ATK than there are MAG.
-Magic Sword Chaos has a very strong ATK increase, it is harder to increase MAG with sub equipment than ATK.
I've opted to omit some things (ideas I and others discussed) because I think they may be of lesser importance or too difficult to try to balance. I think I'll leave it at this, but if there's anything I should omit, please let me know. I don't want to suggest undesirable changes to 3peso. I would feel bad if something was changed as a result of my input and it wasn't wanted.
EDIT: Oh yeah, I forgot, adjust RNG. That one's important, so I'll add that.