Oh Hey.. it's Ken Bieber.. or maybe Justin Amada? ahahah....

Koromaru

• Date of Birth: N/A
• Zodiac: N/A
• Height: N/A
• Blood Type: N/A
• Initial Persona: Cerberus
• Ultimate Persona: N/A
• Weapons: Knife
• Arcana/Social Link: Strength

Koromaru is a shiba-inu who joins the Specialized Extracurricular Execution Squad in Persona 3. Koromaru was a stray dog that Fuuka Yamagishi and Yukari Takeba played with regularly. A housewife tells them that Koromaru's master, a monk from Naganaki Shrine, had died in an accident (about 6 months ago from June 20). Koromaru continued to protect the shrine and wait for his master's return. One night, a rogue Shadow is detected outside of Tartarus. The shadow wanders into the shrine area, where it is killed by Koromaru. Akihiko Sanada manages to reach the shrine, only to find the shadow defeated and Koromaru injured. Akihiko is very impressed at the dog's bravery and intelligence, and Mitsuru Kirijo makes sure that he receives the best veterinary care possible.

Ken Amada

• Age: 10 (11)
• Date of Birth: June 24th, 1998
• Zodiac: Cancer
• Height: 140 cm (4'6")
• Blood Type: AB
• Initial Persona: Nemesis
• Ultimate Persona: Kala-Nemi
• Weapons: Long Spear
• Arcana/Social Link: Justice Arcana

He is mature, but sometimes he is too precocious for his own good. He uses long spears to make up for his short stature. His Personas are equally as large (being the largest of the personas) to contrast his short stature, and can be used for healing, or to cast Light-based spells that occasionally instantly kill the enemy. He can also use single target Zio spells.

Akihiko Sanada

• Age: 17 (18)
• Date of Birth: September 22nd, 1991
• Zodiac: Virgo
• Height: 175.5 cm (5'8.5")
• Blood Type: O
• Initial Persona: Polydeuces
• Ultimate Persona: Caesar
• Weapons: Gloves & Knuckles
• Arcana/Social Link: Emperor/Star (P3P Female MC Only) 

Akihiko Sanada is the captain of the Gekkoukan High School boxing team and, along with Mitsuru Kirijo and Shinjiro Aragaki, one of the original member of S.E.E.S.. He and Shinjiro grew up in an orphanage together with Akihiko's little sister, Miki, who died in a fire that destroyed the orphanage. Devastated by her death and feeling powerless that he could not save her, Akihiko vowed to become stronger. He took up boxing so he could learn how to fight, becoming a champion student boxer in the process.

Mitsuru Kirijo

• Age: 17 (18)
• Date of Birth: May 8th, 1991
• Zodiac: Taurus
• Height: 166 cm (5'4")
• Blood Type: O
• Initial Persona: Penthesilea
• Ultimate Persona: Artemisia
• Weapons: Rapier
• Arcana/Social Link: Empress

Mitsuru Kirijo is the only child of Takeharu Kirijo, the head of the Kirijo Group. She is Gekkoukan High School's valedictorian and the student council president and is part of the school fencing team. She is one of the most respected and popular students at the school. Before the protagonist joins, and even to a degree after he joins, Mitsuru serves as the leader of S.E.E.S. due to her natural talent for leadership.

Ryoji Mochizuki

• The surname "Mochizuki" means Full Moon.
• He shares his last name with Mari Mochizuki from Devil Survivor.
• The reason why Ryoji's shadow form is similiar to Thanatos is perhaps because he himself is Thanatos, since he also doesn't like pain and people suffering.
• He has a mole under his left eye and his eyes are blue, similar to Pharos.

Pharos

Pharos is an important figure in Persona 3, appearing as a young child, he is first seen upon the arrival of the Protagonist in the dorm, where he gives the protagonist a contract, prompting him to sign his name. It is later revealed that the contract that Pharos had the protagonist sign allows the protagonist to access the Velvet Room, with his reasons and purpose unknown. He is shown to have a certain understanding towards the Shadows, and upon the Protagonist's first attempt of summoning his Persona, Pharos can be seen smiling in front of the protagonist, encouraging him to fire the Evoker.
Pharos is shown to be residing within the protagonist's psyche, where he shows up only within the period of the Dark Hour. It should also be noted that Pharos can only be heard and seen by the protagonist. Pharos constantly speaks of "the Fall", and would often reveal vague hints of the Dark Hour's nature, along with the "ordeals" every full moon. At one point Pharos would request the protagonist to be his friend, allowing the protagonist to forge the Death social link.
As S.E.E.S destroys the Shadows that appear during the Full Moon, Pharos slowly regains parts of his memories, along with his role. It is not until the destruction of the final Shadow, that Pharos' memory is fully restored and he is reminded of his role. He shows up the next morning, where he bids farewell to the protagonist, saying that it is time for their parting and that he would treasure the conversations and memories they've created.
Pharos' nature is later revealed. In the year 1999, when the experiment utilizing Shadows being conducted by the Kirijo Group was interrupted by Eiichiro Takeba, Death was forcefully ripped apart from his components, and escapes towards the Moonlight Bridge. Once there Aigis, the last remaining anti-Shadow weapon that survived Death's rampage, later engages the Shadow. However, even in an incomplete state, Death's potential was far greater than Aigis anticipated. In an act of desperation, Aigis sealed Death in a young boy's mind, using it as a vessel to keep Death from re-bonding with his counterparts. The young boy, who lost his parents to a 'car accident' caused by Aigis and Death's battle is the protagonist.
Inside the protagonist, Death slowly assumed a human form, as well as sub-consciously bringing the Protagonist to Port Island, the first place where Death was born. With the "emotions" and "feelings" the protagonist bestowed towards Pharos, he would later assume to form of an individual person, Ryoji Mochizuki after leaving the protagonist's psyche.