The Mini Satana, also known as Imp, is an enemy in Final Fantasy IV: The After Years. They are only moderately dangerous and can be dispatched of without too much trouble, unless two or more appear in a battle, in which case it is best to defeat at least one of them as quickly as possible to minimize the amount of spells cast at the party. They counter physical attacks with Confuse, but this can be neutralized with Silence.
"Satana" refers to Satan. Satan comes from a Hebrew ha-Satan which means "the accuser." It is the name of the Devil in Abrahamic religions. Satan is also one of the seven princes of Hell in Christian Demonology. He is attributed the deadly sin of Wrath.
imp is "a small, mischievous devil or sprite."An