About the - Element MP cost : -% (属性の消費MP : -% )and - Element Delay : -1 (-属性の遅延-1).
It also applies to Physical skills, such as the [+% element] weapons.
Too lazy to check how things like FIR/WTR/ELE/ETH MP cost : -25% work with Ice Sword Heat Hand(SLA+WTR+FIR),
but even without stacking elements, it is quite a strong strategy.
So translations shouldn't be like 'Fire Element Magic MP Cost: -25%', but 'Fire Element MP Cost: -25%' or something like that.
Same thing applies for Mystia's Passive, which also reduces MP cost for Physical Skills like Stun Blow, Butterfly Storm or Capture Web.
I'm not sure if it works with weapons having something like [Added Effect : Poison].
I don't know exactly about the + Cast Speed or the + Power, but I think it applies to physical attacks, too.
The wording in the JPN one is rather weird. Nobody should be able to 'Cast' physical attacks.
Some errors or ambiguities.
Chen's Passive means that normal attacks occasionally become row attacks.
Reisen's Passive No.3 seems a bit ambiguous. Passive No.5 too.
Hina's Passive No.6 is gives +5% to Cast Speed, instead of +25%.
Luna Child's Passive No.2 gives +5 to Silence Success Rate, instead of +15
Pu's Passive No.3 and No.6, 属性強度 was translated to 'Elemental Strength' in GoS.
In DoD, it gives bonus damage for attacking weaknesses , and DOES NOT give damage reduction for attacking strong spots unlike GoS.
By the way, No.6 should be +20%, instead of +10%
Angel's Passive No.1 gives ○Light
Buckbaird is actually Backbeard from Gegege no Kitaro. I think.
Sylph's Passive No.5 is Land : Lightning (65) instead of (60)
Garbangol's Passive No.1 is now just 'Auto-cover', which covers all allies with low health. (Sort of like Tibetan Doll)
By the way, Garbangol's 火事場のクソ力 comes from Kinnikuman. In this game, it gives a attack bonus when on low health.
Translated to Burning Inner Strength in some sources.
G-3 Passive No.2 should be 'Physical Skill attack speed : +5%' or something like that.
Furfur's Passive No.2 should be △Fire.
Hakurei Miko's Passive No.4,5,6 gives bonuses to both Light and Dark.
This file seems to be from an older version. Garbangol's passive changed from 'Auto-Cover : 25%' to just 'Auto-Cover' in 2.06.
That's all I can find for now.