Persona 5's official site updated today with new profile pics and information on the four main protagonists/party members.
First we see Protagonist, who is a 16-year old high school and leader of the thief group. He seems mature at first glance and is currently living with his parents' friend in a teahouse. The reason for this strange living condition is currently unknown.
Next is Ryuji Sakamoto, who is also 16 and attending the same high school as Protagonist. He is wild-natured and considered a problem child, which means teachers and advisers constantly watch him. Apparently he wasn't always like this but the event(s) that changed him aren't known at this point.
Ann Takamaki is the same age and attends the same school as the other characters. She is one-quarter American and, due to her differences in apperances compared to the other students, keeps mainly to herself. There's a strange rumor going around her school but it's unclear whether it's true.
Finally we have Morgana, the most mysterious member of the phantom thief group. She has the height of a child and the vague appearance of a cat. Not much else is know about her.