List of thematic parallels

Throughout the Xeno series, there are parallels between other games.

Protagonists

 * Noah's appearance, role, and personality is similar to Fei Fong Wong.
 * Both hate fighting and taking lives, and only does so just to survive or given no choice.
 * Both Fei and Noah met their respective lovers while on opposite sides of war, Mio to Agnus, Elly to Solaris.
 * Both have reincarnated throughout history.
 * Noah's Ouroboros form resembles that of Weltall, Fei's primary Gear.
 * Additionally, his name is shared with Xenogears' development name, Project Noah, as well as Krelian's goal to resurrect Deus.
 * Mio's role is similar to Elhaym Van Houten.
 * Both Mio and Elly met their respective protagonists while on opposite sides of war, Noah to Keves, Fei to Bart's crew.
 * Both have reincarnated throughout history.
 * Both eventually fell in love with their respective protagonist.
 * Additionally, Mio's long hair appearance evokes's Elly's knee-length hair.
 * Matthew's appearance strongly resembles Fei Fong Wong.

Antagonists

 * N's backstory and motives are similar to Lacan/Grahf.
 * Both are preincarnations of the main protagonists Noah, and Fei Fong Wong respectively.
 * Both lost their loved ones, N to M, Lacan to Sophia, resulting them taking dark and dangerous paths.
 * N also has similarities to Id.
 * Both are an antagonistic version of the protagonist.
 * Unlike Id, N exists as a separate individual, rather than an alternate personality.
 * Both eventually reunited with their original selves after being defeated for the final time.
 * N is also similar to Jin from Xenoblade Chronicles 2.
 * Both wear masks to conceal their faces.
 * Both lost someone close to them, resulting in them siding with the main antagonistic force.
 * Both eventually find peace after their final defeats.
 * Z's overall appearance is similar to Xenogears' main antagonist, Krelian.
 * Z's true form is similar to how Krelian took the form of a disembodied face when Fei encounters him in the Path of Sephirot.
 * How Shania betrayed the party is similar how betrayed Fei and his group.
 * Both betrayals are a result their jealousy and insecurities towards others, resulting them to side with the main antagonistic force of their respective game.
 * Both parties were betrayed when they attempted to escape from Li Garte Prison Camp and Solaris respectively.
 * Both were transformed after their betrayal, Shania was transformed into a Consul after her suicide, while Hammer was transformed into a Wel-Gear.
 * Both later regret their choices before they die after being defeated by the party.
 * Z's motives and nature are similar to the main antagonist of Xenosaga, Wilhelm.
 * Neither are real beings. Z is a manifestation of the fear held by the consciousness stored in Origin, while Wilhelm was created by the Collective Unconscious to protect the Lower Domain.
 * Both treat the world as if it were entertainment, with Z seeing the world's events as a film, and Wilhelm seeing them as a play.
 * Both trap the world in a time loop to avoid a perceived catastrophe in the future. Z has frozen time at the point of the two worlds' collision, creating Aionios, the "endless now". Wilhelm resets time to before the universe's collapse, a cycle known as Eternal Recurrence.
 * Both revived previously deceased characters to serve them, Z revived them as Moebius, while Wilhelm revived them as Testaments.
 * The Consuls are similar to the Testaments.
 * Both have been revived by their leader to serve them.
 * Both wear face concealing masks to hide their identities.
 * Consul D's helmet is visually similar to Grahf.

Supporting characters

 * M is similar to Mother Sophia.
 * Both are preincarnations of a tritagonist who is close to a pre-incarnation of the protagonist.
 * Both of their deaths involve self-sacrifice so another can survive.
 * Both of their deaths causes their lovers to take a dark path.

Setting

 * Keves and Agnus soldiers reborn and forget their past lives after death is similar to how Blades in Xenoblade Chronicles 2 reborn after their previous driver dies and has no memories of their past.
 * The concept of reincarnation is also one of the core theme of both Xenoblade Chronicles 3 and Xenogears
 * The castle and technology of Keves are base on the Mechonis in Xenoblade Chronicles, whereas the castle and technology of Agnus are base on Indol in Xenoblade Chronicles 2.

Others

 * Dmitri Yuriev (spelled the same as his Japanese name, Dimitri Yuriev) is referred while the party is on The Ark.
 * The Cradle is very similar to the Kadomony from Xenogears or the tube that Kahran Ramsus was born.