A fan put together this comparison chart of the main Persona 4 characters as featured in the currently airing anime and various video game versions:

You may want to take advantage of this at full size, but from left to right: as they appear in the anime, the opening of the anime, the character introductions on the anime's website; then an in-game portrait from the original on PS2, in the opening of that game, in the an anime cut-scene from the game, and their character introductions from the game's website; then website character introduction portraits from the Vita game, Persona 4: The Golden; then character introduction portraits from the 360 and PS3 version.
Seems like a lot of work to make this chart for designs that seem to have stayed pretty faithful, but Yaraon! notes that the faithfulness should make fans of the original happy.