User blog comment:Yapby/All Unreleased Contents (Units, Quests, Raids)/@comment-26382680-20150616022214/@comment-26105749-20150618180325

It's actually pretty OP, White Armor gives a 30% ATK & DEF boost, nullifies all status ailments & negate extra element damage. With Melchio's Extra Skill he gains an additional 20% all stats so 20% HP & REC while ATK & DEF 50% also he gains the ability to cure status ailments with the use of BB or SBB.

Regarding his UBB it adds 75% damage reduction for a turn and attacks with almost all elements excluding dark which can be easily buffed on from another unit & adds the nulification and cleansing of status ailments. I can see how it doesn't seem special as you may have White Armor equipped which gives all his BB's the cure status ailments in this case it's for the multi elements and damage reduction that makes it pretty good.

So basically Melchio becomes another unstoppable unit as long you have White Armor equipped on him. He'll become a solid replacement for units like Kanon & Sagavehl if don't those units that cures/nulifies status ailments.