Non-Normative Arcana For Party Members
Persona 3 and Persona 4 both had an interesting cast of characters, but your party generally fell within the same parameters for their associated arcana. The attractive female is The Lovers, the beefy guy is The Emperor, the quirky best friend is The Magician, etc. Since the morality of the party in Persona 5 seems to be different compared to the parties in Persona 3 and Persona 4, it would be good if the parties also had different arcana. Atlus could do this in two ways. One, they could have different arcana entirely, utilizing arcana that weren’t in the party before, such as The Devil, The Moon, or The Hierophant.
Alternatively, they could also make the arcana be associated with different personality types; for example, The Lovers could belong to a shy boy, or The Emperor belonging to someone with a quiet strength. Either way, Atlus should shake up the party somehow, and this is a quick and interesting way to do that.
