Eos

Eos (エオス, Eosu), sometimes referred to as Dagda, is the Heartless of Dagda and other half to Xose, a Nobody. For reasons yet unrevealed, Eos retains a human form, though different from his original self.

A carefree and naive person, Eos seems to demonstrate a myriad of emotions, something thought to be contrary to his nature. Despite this, the powers dwelling within him still lie in dark territories, which allows him to use it in combat.

Appearance
While his age is unknown, Eos has the appearance of a really young teenager, holding himself up in relatively bright colors and expressions. An oddity amongst his kind, Eos seems to look different from his original self, sporting slightly tanned skin, vibrant hair and eyes.

Although he possesses a small frame, Eos has quite a few tonned muscles.

Abilities
The Heartless of a Keyblade Wielder, Eos is relatively powerful and can wield a variety of abilities during his fights, mainly his darkness-related powers. He appears to have some sort of superior presence in regards to lesser heartless, although Eos can't outright control them, they seem to back away from him.

Darkness
Through the power of darkness, Eos can augment the power of his attacks and magic abilities, giving them a purple shading. When used on his weapons or magic, they are, indeed, less susceptible to other forms of attack and even resist without breaking apart, allowing him to keep a spell longer than it should last. However, he is capable of using it in a simple raw form and send out dark blasts that chase his opponents. While Eos isn't adept at forming constructs or weapons from it, he often wraps it around himself as some kind of defense armor.

Much like other denizens of the dark, Eos creates Corridors of Darkness to slowly travel and teleport, although, it seems to be something taxing.

Eos is said to be capable of stealing hearts with his darkness, however, he is yet to be seen doing it.

Trivia

 * He is based on Meliodas from the Nanatsu no Taizai Series.
 * The name Eos is Greek for Dawn.