The colour of passion and freedom

As some of you, or many of you, may have noticed, Persona 5 uses a lot the colour red.
The reason being, it represents passion and freedom.

The main characters in the game are bounded by the rules of society untill they decide to rebel against everyone and stand up against, as they call them, "rotten adults"; those who have become corrupted and are blinded by their own distorted desires.

When they do manage to stand up against society, a bright red colour appears in their eyes. It is also the colour of the calling card they send to every target.

Red also represent the colour of revolution and how they are willing to spill blood to manage to make a change.
And finally, it also represents danger, to let their targets that nobody is safe from the Phantom Thieves and that everyone should watch their step and behaviour.