Key Units are able to "adopt" certain passives of their Key Holder, which means that said passives will benefit the Key unit even after transformation/invocation. When a unit's passive is adoptable, he is able to lend this passive to all Key units that he can equip, which means that adopted passives stay the same for all Key units of the same class.
Not all passives can be adopted. The following tables will show which units are able to lend their passive. It is worth to mention that this mechanic was not initially intended by the gameplay but resulted from a bug[1]. However, now all following ally passives are designed to suit this mechanic.
The general rule is that passives can be adopted which are auras and/or stat influential. If the passives does not require the unit to fulfill a condition, it can ususally be adopted. This allows active auras such as the Paladin Character's "Oath" active to lend its full effect as well. On the other hand, passives such as Mikaela's "Tranquility" will not be adopted.
Report to the admins immediately if you have different test results.
Legend:
x = Not adopted
NAME = adopted
Archer
Passive 1
Passive 2
Passive 3
Arrow Trimer
Quick Shift
Energy Release
Unit
Passive 1
Passive 2
Power Wind
Critical Time
x
x
x
Energy of Courage
Snowstorm Bear's Protection
x
Power of the Queen
Will of the Queen
x
Dancer's Dance
Shell Fragments
x
Will of Steel
x
Incanter
The Incanter Character was not avaible when Characters could equip Keys.
Unit
Passive 1
Passive 2
x
x
x
x
Bloodstain
Soul Collection
Very Powerful Snow
x
x
Fire Essence
Mage
Passive 1
Passive 2
Passive 3
Intelligence Increase
Weapon Use
Flame Study (Critical chance is; Fire Seals are not)
Unit
Passive 1
Passive 2
Angel's Blessing
Angel's Caress
Master Conductor
x
x
Fox's Instinct
x
Eternal Nightmare
x
Enhanced Horsepower
Frozen Enchant
Witch of Death
Wrath of Fire
Reflux
Paladin
Passive 1
Passive 2
Passive 3
Sacred Prayer
x
Blessed Battle (Heal is; Skill damage is not)
Note: "Oath" auras will continue to affect the party, depending on the selected Oath upon invocation.
Unit
Passive 1
Passive 2
Armor of Light
x
x
Time for Drink
Nectare's Revenge
Athena's Shield
(Aura adopted;extra damage is not)
Righteous Revenge
The Gift of God
Priest
Passive 1
Passive 2
Passive 3
N/A (Please, submit test runs)
Euphoria
Become Smarter!
Unit
Passive 1
Passive 2
x
Grim Melody
Nature's Breath
Forest's Care
x
x
Starlight in the Sunset
x
x
Sanctuary
The Wolfpack
Spirit's Cry (Aura adopted; extra heal is not)
Prayer of Tethys
Sacred Heart
Rogue
Passive 1
Passive 2
Passive 3
Perfect Attack
Bloodthirsty Blade
Maximize Chance
Unit
Passive 1
Passive 2
x
x
x
Power Within
x
x
Dramatic Smile
x
x
Weapon Expert
Heartfelt Revenge
Boldness
Stretching
Fist of the Titans
Warrior
Passive 1
Passive 2
Passive 3
Sword Training
Physical Strenght
Intensifed Rage
Unit
Passive 1
Passive 2
Obligation
x
x
x
Aesir's Blessing
Vanir's Curse
x
Rejection
Uplifted
Titan's Strength
The Ultimate Order
x
Guardian Shield
x
Hammer Hell
Hammer Heaven
A warrior's Order
Beast Penetration
Intimidating the Kronos
Inspiring Presence
References[]
↑Twitch Stream, USA Gamevil, "Dragon Buster 1st Wave"
Adopted passives are based on test results according to various players