I’d say the best method for Persona-choosing is to decide their arcana then take a gander at the page for it on the wiki. And remember: you can modify existing Personas or demons to fit your needs. For example, Jun and Junpei share a base Persona (Hermes), and Ryuji’s ultimate Persona is an existing Persona (Seiten Taisei); the only difference is the unique designs.
(edited by Cait_Sith)