You can now take out selfies and send pictures to your fellow Phantom Thieves.
The protagonist can date a girl with a romance relationship here.
White Day is added a day prior to the protagonist's departure from Tokyo.
This includes Sae, who the protagonist cannot enter a relationship with.
All maxed female Confidants who the protagonist didn't date will give him a chocolate (which gives 100 SP for one ally) they bought on Valentine's Day.
They've added brand new characters, Kasumi/Sumire Yoshizawa/Violet, Takuto Maruki, and Jose.
Large amounts of content and even more in Persona 5 Royal.
The game tackles things like suicide, abuse, sexual harassment, abuse of power, neglect, loss, and more.
The game is much darker and has more mature themes than any other Persona game.
Players can use improved stealth to ambush enemies to attack first.
It also deals with personal freedom with regards to society and how society can be both harmful and beneficial to it. For example, Kamoshida (the game's first villain) is a teacher who is found to be abusing his students and sexually harassing his female students.
The game takes on the themes of society since the game is about outcasts fighting against people of power who are abusing their power.
The soundtrack is very stylish as it uses elements of Jazz and Rock and features Lyn Inaizumi as the vocalist.
Ren Amamiya/Joker, the game's main protagonist, is arrested for a crime he didn't commit and forms a group called The Phantom Thieves with his friends to fight against tyranny.
Likable and relatable characters, including Goro Akechi, despite his psychotic breakdown.
Social Links (called Confidants in this game) can give you special abilities that can be very useful, like Hifumi's ability that lets you switch members during a battle.
Every playable character can now use ranged weapons just like in the first Persona game.
Like the previous Persona games, the English dub is still as good as the Japanese original.