The Imp is an enemy from Final Fantasy XIII-2. It resists magical attacks and attacks of all elements, so the party should use a paradigm involving many Commandos, such as Cerberus (COM/COM/COM), in order to avoid attacks that the Imp is resistant to. It does not have much HP, so it should not be much trouble to defeat.
The Imp is a Synergist. It has high HP and magic growth and halves all magic and elemental attacks. Unfortunately, it is vulnerable to physical attacks and is limited to bestowing Shell, Bravery and Faith. It is not a good monster to infuse, as it bears the inheritable Jungle Law passive ability.