Thanks for your interest in the game!

The purpose of this post is to help those who are either unfamiliar with the Persona series - if you post here, others or I will help you by giving you input as to which Arcana to assign to your character as well as possible Personas!

Remember that the Social Links FAQ has a bare-bones explanation as well as links to other sources.

If looking for a catalog of some sort, the following links may be helpful. Remember, you are not restricted by canon - just because Unicorn is a Hierophant in Persona 4 doesn't mean you can't choose to shoehorn it into any damn Arcana you please.
List of Person 4 Personas.
List of Persona 3 FES Personas.
List of Persona 2: Innocent Sin Personas
List of Devil Survivor 2 Demons
List of Greek mythological figures.
List of Maya gods and supernatural beings.
Lists of deities.

Character: Name of the character, and some background or traits of theirs you tend to focus on.
Canon: Any reference links you can provide for us?
Arcana preferences: If you already have like three or five Arcana in mind, feel free to rattle them off.
Persona preferences: Have a preference to the gender of the Persona? The origin of the Persona? Prefer a real world figure as opposed to your character's in-world mythology, or vice versa? Feel free to put in any specifics you have in mind, there.

<b>Character:</b> <b>Canon:</b> <b>Arcana preferences:</b> <b>Persona preferences:</b>

Post yours, others will comment, and profit!

Have fun! And remember, everyone is entitled to their own opinion and interpretation.