All of Yoko Taro's major games (Drakengard series and NieR series) are connected within the same universe, although the connections are often subtle and require players to piece together the lore. This creates a rich and intricate world for fans to explore.

The android Accord appears in Drakengard 3, as well as games outside of the Drakengard/Nier universe. She is portrayed as a time-traveling android whose goal is to observe historical events, and can be seen as a representation of Yoko Taro himself, who is also observing as the game director.

One of the central themes running through all of Yoko Taro's games is the exploration of what it means to be human. His stories often delve into the darker aspects of human nature, such as violence, greed, and self-destruction, while also highlighting the potential for compassion, empathy, and sacrifice.

Yoko Taro's games often depict cycles of violence and conflict, exploring the causes and consequences of war and the difficulty of breaking free from these patterns. His stories often suggest that violence breeds more violence and that true peace is elusive.