Persona

Persona are beings born from people's personalities when they accept and overcome the being's opposite existence, the Shadow that exists within their hearts. However, for Nero, this power was awakened artificially and he did not come to grips with his Shadow for millenia, only doing so when he was dragged into his inner world in the "Characters Chapter".

Personae have the ability to evolve. They are awakened when one accepts their Shadow, and evolve to their final form when someone finds the strength of heart to resolve the problem that spawned the shadow. These are known respectively as Initial and Ultimate Personae. Only five people (Nero, Crystal, Jackie, Lolita, and Ling) have the ability to use Persona, and they usually use them as an opening move as they are affected by the summoner's strength and will. However, since leaving the world they came from Personae can only be summoned similarly to familiars and are much weaker by comparison.

Arcana
All Personae - and by extention all people - are aligned to a specific Arcana. Generally one can tell a Persona's abilities by what Arcana they are aligned to, such as a specific Arcana specializing in a particular Element. Though that is not always the case, it rules the majority. Nero's Wild Card ability allowed him to use Personae from all Arcana, but he lost that ability when they left the world and can only summon Arthur Prime and the White Stag (and later Alice and King Avalon as well). The Arcana are numbered 0-21, with some numbers (Such as 11 and 20) repeating as different ideologies are represented by Arcana of the same number. (In the example, 11 is both The Strength and The Lust, while 20 is both The Judgement and The Aeon.)

The Wild Card
Nero in particular has the "Wild Card" Ability, which allows him to use a Persona from any Arcana that represents the bond he has with that person. Normally there is only one person he bonds with enough to summon a Persona, though rarely two people will have the same Arcana (such as Crystal and Mio) which allows him to summon two Personae aligned to that particular Arcana.

Personae
This is a list of Personae usable by the six group members listed above. Nero's Personae are listed separately due to encompasing all Arcana.

Trivia

 * After the battle in which he first summoned King Avalon, Nero reflected on his existence as a fusion between Arthur and Alice, making the statement "When a fool falls in love, even he can save the world." This references Arthur and Alice's arcana, The Fool and The Lovers respectively.