Effects on duplicates
Being a flawed duplicate of the original and true Ash, AoD Black Haired Ash is susceptible to the reality-warping powers of the Evil Dead, wherever a normal human can only be possessed. Indeed, the Evil Dead was able to clone his organism and mold a fully-functional "mirror duplicate": Bad Ash. The process started with the creation of the Tiny Ashes. This unusual and twisted "fusion" kinda imbued the Evil Dead with the childish and lunatic side of AoD Black Haired Ash's consciousness, and that made the Kandarian Demon acting in an "odd" and "comedic" way since that point.
As corollary to this, Bad/Evil Ash is more human-like than a normal Deadite and his behaviour and organism often react in a "lunatic" way.
As a side note, the Vortex Necronomicon managed to physically "tweak" the body of the AoD Black Haired Ash.
In 1387 A.D. the Evil Dead was roaming again because the Necronomicon Ex Mortis. Three Books of the Dead were awaiting in an unholy cemetery. Since the AoD Black Haired Ash failed to correctly recite the incantation, the Evil Dead combined its essence with the power of the two Books left and the default demonic energy of the unholy cemetery and had the power to awake an old army of rogue and corrupt soldiers, turned into skeletons after normal post-mortem decay. The Army of Darkness was born. However, the spirits of the Demonic Skeletons had been heavily influenced by that specific manifestation of the Evil Dead, which was less brutal and more odd because its previous "fusion" with AoD Black Haired Ash via Tiny Ashes/Bad Ash.
The Knowby Warrior