Pluto

Pluto is the Roman counterpart of Hades. As Pluto, he becomes more disciplined, militaristic, and warlike. While the Greeks feared him as the Lord of the Underworld, the Romans respected him as the God of Wealth.

History
Pluto's regions are supposed to lie under ground; and as he was the first who taught men to bury their dead, it was thence inferred that he was king of the infernal regions, whence sprung a belief, that as all souls descended to him, so when they were in his possession, he bound them with inevitable chains, and delivered them to be tried by judges, after which he dispensed rewards and punishments according to their several deserts. Pluto was therefore called the infernal Jupiter, and oblations were made to him by the living, for the souls of their friends departed.

Pluto was extremely revered both by the Greeks and Romans. He had a magnificent temple at Pylos. Near the river Corellus, in Bœotia, he had also an altar, for some mystical reason, in common with Pallas. His chief festival was in February, and called Charistia, because their oblations were made for the dead. Black bulls were the victims offered up, and the ceremonies were performed in the night, it not being lawful to sacrifice to him in the day time, on account of his aversion to the light. The cypress tree was sacred to Pluto, boughs of which were carried at funerals.

The Son of Neptune
Pluto appears in a flashback during during World War II in one of Hazel's blackouts. He appeared to visit his daughter for her birthday, giving her a set of colored pencils and a sketch pad. He also apologizes for her curse, which causes anyone that touches the stones she pulls from the ground to have bad luck, saying she must hate him for it.

While Hazel's mother originally blamed Pluto for Hazel's curse, it was actually her fault. Pluto had sworn on the River Styx to offer her anything, but in her greed she wished for all the riches of the Underworld. Pluto warned her to ask for anything else as the greediest wishes cause the most sorrow, but in the end he obeyed her wish, giving Hazel the ability to pull precious stones and metals from the ground.

When Thanatos is eventually freed, Hazel asks if her name is on the list of escaped souls. The god tells her it is not, explaining that Pluto may have thought her life wasn't finished or it was an oversight.

When Hazel returns to camp, she is asked if her father has contacted her. She replies in the negative, but it is better that Pluto did not go to see her because he would have to acknowledge that she was alive and would have to bring her back to the Underworld. In Pluto's own way, not contacting her is his gift to her.

Personality
As Pluto, he becomes more disciplined, militaristic, and warlike than he is as Hades. However, just like Hades he seems to care deeply for his children and any woman he falls in love with, being very protective of them. When first visiting his daughter Hazel, he apologized for her curse and offered her a present. He then went upstairs and tried to convince his current lover to stay where he could protect her and their child. He also cares enough that he ignored his daughter's existence, allowing her to live because she was also one of the souls that escaped the Underworld.

Appearance
As Pluto, he dresses in a dark suit with a black an platinum tie and a tombstone gray shirt. If you look at his suit closely, you can see the souls trying to escape from their agony, much like Hades' robe. He still has the silver ring on his finger, which are as pale as the rest of his body. He is so pale that it is described as being the same color as cold milk. He looks very much like Adolf Hitler, but this could simply be what people see when they look at him (as when Percy saw Hades, he looked like every evil dictator in history). He also doesn't have a mustache and is clean shaven, with greasy black hair. His eyes are also very similar to his Greek form, being fiery, angry, and full of mad power.

Abilities
Pluto, being the god of the Underworld, wields dark and necromantic powers. He is one of the three strongest gods of Olympus and is rivaled only by Jupiter and Neptune.
 * He has the ultimate powers that a god can possess.
 * He can summon and control legions of the dead and zombie warriors (ultimate level of necromancy).
 * He can unleash endless waves of the dead or dark souls to maul or destroy his opponents.
 * He can control darkness and shadows thus using them for concealment as well as attack.
 * He can control to a large extent the dead and spirits native to the Underworld.
 * He can create and control dark energy (form of black fireballs, force-fields, dark energy balls, blasts and lightning)
 * He is a shapeshifter with the ability to transform himself into various fearsome demonic forms.
 * Wields a Stygian sword, capable of absorbing the essence or life-force of monsters and mortals respectively.
 * He has the power to use fear as a weapon.
 * He has the power to manipulate and control the riches under the earth's surface.
 * He can control the earth (though possibly on a lesser degree than Gaea as she is the primordial goddess of earth and all earth is her domain).

Trivia

 * Pluto is the name of the dwarf planet, once officially the smallest planet categorized.
 * Pluto is often considered to be a more decent side of Hades. Whereas Hades was considered the abductor of Persephone, Pluto was considered the loving husband of Proserpina.