An Innocent Devil is a creature that can only be created by a Devil Forgemaster, and are said to be created through even the mere "wisp of conjured matter".
While they are beings born of darkness, their namesake stems from them being largely unaware of their wicked origins and intended malevolent existence, and act ambivalently without selfish or conceited motivations, while being driven to serve and protect their creator, whom they have unwavering and absolute loyalty to.
Hector can summon Innocent Devils in Castlevania: Curse of Darkness, and as an extension of the contrast between Hector and Isaac, Isaac's own Innocent Devils are fought during the battles with him. They play a major role in the game, by helping Hector to fight Dracula's minions and help him resolving riddles/puzzles. They also boost Hector's stats. However, they are completely optional in battle, and the player may choose to not use them. There are so far six known types of Innocent Devils: the Fairy-Type, Battle-Type, Bird-Type, Mage-Type, Devil-Type and the Pumpkin-Type.
Devils' health is represented by Hearts. When Devils are attacked by enemies or when Hector uses a spell (unless using the Mobeius Brooch), the Heart gauge decreases. Hector can't use spells when the Innocent Devils' life is too low. If their life goes to zero, they will disappear and Hector will have to find Hearts to make them come back from death.
Just like Hector, Innocent Devils earn XP Points whenever an enemy is killed. They can learn new attacks and get stat boosts.
Aside from levels, Innocent Devils can evolve with Evolution Shards that drop from enemies. With enough Evolution Shards, an Innocent Devil can evolve and take a new form. Innocent Devils can evolve three times max, though some species have shorter evolution lines.
Depending on what weapon you use, your Innocent Devils will evolve differently. The color of these shards depends of the weapon Hector uses to kill his enemies.
- Red Shards - Swords
- Blue Shards - Axes
- Green Shards - Spears
- Yellow Shards - Punches
- White Shards - Special Weapons
Innocent Devils will also randomly create Devil eggs, that can create new level 1 Devils with the help of Julia. Those Innocent Devils will have higher stats compared to their "parents", being a new generation. The higher the generation, the higher will be the base stats of the newborn Innocent Devil at level 1.
The first Innocent Devil is summoned in the Abandoned Castle. Fairy Devils don't attack (except for a few Evolutions that possess attacks, but they're quite harmless). They can cast spells that can heal Hector or cure him from poison or curse. They can also open chests, and certain higher levels of fairy-types can translate messages. Enemies can't attack Fairy Innocent Devils.
The second Innocent Devil is summoned in the Baljhet Mountains. As the name suggests, Battle Devils are pure killing machines, with great melee abilities, created to attack enemies and protect Hector. They can open metal doors that bar Hector's passage (for example, the one blocking the Mortvia Aqueduct in the mountains). Hector can perform Chain Attacks with them. They are one of three types also seen used by Isaac, who uses an Iytei and a Rasetz.
The third Innocent Devil is summoned in the Mortvia Aqueduct. Bird Devils are good in air battle and can help Hector for jumping over large holes that cannot ordinarily be passed by lifting Hector and flying for a short amount of time, the ability of which can be upgraded to access the Tower of Evermore. They can juggle light enemies, allowing Hector to air combo easily. This is one of three types also seen used by Isaac, who uses a Crimson.
The fourth Innocent Devil is summoned in Cordova Town. Mage Devils are physically weak, being not very good at fighting enemies physically, but can cast powerful spells which inflict heavy area damage. They can also help Hector by using a "stop time" spell, which, for a limited time, freezes time for everything but Hector and bosses, who can immediately break the spell.
The final mandatory Innocent Devil is summoned in the Eneomaos Machine Tower. Devil-Type Innocent Devils are considered a balance between Battle and Bird-Types: they're good at melee and air battle, with high mobility and attack power, being very aggressive whenever a enemy is spotted. They can also take Hector underground, with a spell that converts both Hector and the Devil into a magic circle. There is only one evolutionary path for this ID, and its final form can only be created by collecting Evo crystals using the Chauve-souris spear. Hector can perform Chain Attacks with them. This is one of three types seen used by Isaac, who uses a The End, named Abel.
An optional Innocent Devil Hector can summon in Dracula's Castle. In order to actually unlock it, it's necessary to forge a weapon called Pumpkin Mace. Pumpkin Devils are really bad at fighting enemies and have a low heart gauge. They however give high stat boosts to Hector, increasing his strength, constitution and luck. They're often considered as the "joke" Innocent Devil, or just as a challenge to players who like to solo as Hector while retaining stat bonuses.