Violence Assassin's Creed Unity is chock-ful of blood, stabbings, and other kinds of murder. Arno is an assassin, and can use many kinds of melee weapons such as swords and axes, as well as ranged weapons like guns and crossbows. Some of the major kills are shown close-up in graphic, bloody detail.
Scary Imagery In one of the side missions, Arno must track down a murderer who has poisoned a well. When you drink from the poisoned well, you hear the voice of the devil (actually just the murderer pretending) whispering to you, and your vision becomes hazy.
Sex & Nudity There is no nudity, but there are scenes of men and women in states of dishevelment at a party thrown by the infamous Marquis de Sade. The Marquis kisses a woman's hand and mentions several lewd acts in his dialogue with you, such as bestiality and sodomy. These are not depicted on screen or discussed in detail.
Strong Language Foul language is omnipresent in Assassin's Creed. One character calls Arno "P*sspot" as a nickname, and f*ck and sh*it are used as well.
Substance Use During an extended flashback sequence, Arno gets drunk and tries to steal some wine. The player controls him while he is drunk, and the camera wobbles and is hazy to simulate drunkenness. Recreational drinking is also depicted with the Marquis de Sade and other characters.
Consumerism Assassin's Creed Unity is part of a series, though you do not have to purchase the other games to enjoy this one. Unity also offers several layers of microtransactions within the game. You can purchase in-game currency to buy clothing and weapons for your character. This isn't necessary to complete the game. There is also in-game content that can only be accessed by doing missions on the Unity website, and in a companion app. Again, none of these are crucial to the gameplay experience.
Discrimination There are no female playable characters in Assassin's Creed Unity, though Elise is a wonderful companion character who is capable and well-written. The game lacks depiction of people of color, or gender and sexual minorities--with the exception of the Marquis de Sade, who hardly counts as positive representation.