Fairly tanky. He has +70% innate max HP, Null Mortal and a whopping 60% damage reduction except from Almighty and Light (or Fire if Teal) damage.
Strongest Magic Caster gives him 5 max MP and +25% Almighty damage, making him a great mage and a counter to MP drainers like Camael and Alice A when paired with sources of extreme MP regen like Demeter and Idun.
It also gives him a Lost Name-like superboost when he is about to act, with Concentrate, 3 MP recovery and an ATK buff meaning his next Magic attack will hit extremely hard.
Speaking of hitting hard, Fallen Down is an Almighty version of Solar Flare (200 BP ST nuke with a 80 BP AOE followup) with Bulwark Pierce and a Debilitate effect on hit.
Great panels that give him +2 MP to natural MP recovery, Concentrate on kill, Null Charm and more Almighty damage.
Cons
Middling AGI makes him hard to slot into specific teams. His AGI is on the slower side for T1 teams, and he offers zero defensive utility if outsped.
Despite his bulk and damage reduction, his low VIT stat means that he crumbles easily to modern demons like Morrighan and Mephisto.