Devil Familiar

A Devil Familiar (sometimes called an Imp, Tiny Devil, or Mini Devil) generally follows the hero around and attacks every once in a while when it is "out".

Alucard can summon his Devil Familiar with the Devil Card. The devil is rather mischievous, but loyal to Alucard. It attacks with a spear. It's curiosity will cause it to push an otherwise inaccessible switch without though of a consequence. By leveling it up, it can become stronger and more aggressive. Alucard is shown to have the Devil Familiar (called "Imp") before and after the events of Symphony of the Night in the radio drama Castlevania: Nocturne of Recollection. It helped him defeat Magnus and insulted Maria.

Nathan Graves is able to summon a devil familiar in Castlevania: Circle of the Moon with the Saturn Card and Black Dog Card. When it is out, whenever Nathan spins the whip and then stops, it will send out a projectile whose power is based on how long Nathan had spun his whip.

Soma can summon the "Imp" familiar by using the Imp Soul in Castlevania: Aria of Sorrow and the Mini Devil soul in Castlevania: Dawn of Sorrow. It attacks by sending projectiles. In Dawn of Sorrow, it can be powered up 3 times (one power up turns it into a female).

Hector and Isaac both have Devil-Type Innocent Devils in Castlevania: Curse of Darkness. Unlike other innocent devils, they evolve in a linear pattern. They can use the Magic Circle ability to allow Hector to slide under low openings. As they advance, they can cause spikes or blades to issue from the Magic Circle. They require a "special spear" (Chauve-Souris) in order to get it's final form named The End. Isaac's equivelent to "The End" is Able, which has appeared in official artwork, cut-scenes, battles, and manga.